[PWGLF] Fix primary particle selection for predictions

[njacazio]

Removed checks for particle charge and validity, retaining only the physical primary check.

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 5 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 4515c81 at 2026-07-25 15:40:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 31 errors and 0 warnings.'
Found 31 errors and 0 warnings.
++ [[ 31 -gt 0 ]]
++ cat /sw/BUILD/891b010223bdbfd7077bb720c11342e6bfef9a09/O2Physics-code-check/errors.txt
PWGLF/Tasks/QC/mcParticlePrediction.cxx:60:14: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:61:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:61:6: error: variable 'enabledParticlesArray' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:88:26: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:120:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:120:6: error: variable 'enabledEstimatorsArray' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:121:14: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:143:59: error: variable 'hestimators' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:144:59: error: variable 'hestimatorsVsITS' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:145:59: error: variable 'hestimatorsVsETA05' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:146:59: error: variable 'hestimatorsVsETA08' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:147:59: error: variable 'hestimatorsVsImpactParameter' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:148:59: error: variable 'hestimatorsRecoEvGenVsReco' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:149:59: error: variable 'hestimatorsRecoEvGenVsReco_BCMC' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:150:59: error: variable 'hestimatorsRecoEvGenVsRecoITS' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:151:59: error: variable 'hestimatorsRecoEvRecoVsITS' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:152:59: error: variable 'hestimatorsRecoEvRecoVsRecoITS' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:153:59: error: variable 'hestimatorsRecoEvRecoVsRecoITS_BCMC' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:154:59: error: variable 'hestimatorsRecoEvRecoVsFT0A' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:155:59: error: variable 'hestimatorsRecoEvRecoVsBCId' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:156:59: error: variable 'hestimatorsRecoEvVsBCId' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:157:59: error: variable 'hvertexPosZ' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:158:93: error: variable 'hpt' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:159:93: error: variable 'hyield' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:161:8: error: constructor does not initialize these fields: pdgDB [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:176:51: error: do not implicitly decay an array into a pointer; consider using gsl::array_view or an explicit cast instead [cppcoreguidelines-pro-bounds-array-to-pointer-decay,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:179:54: error: do not implicitly decay an array into a pointer; consider using gsl::array_view or an explicit cast instead [cppcoreguidelines-pro-bounds-array-to-pointer-decay,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:391:5: error: uninitialized record type: 'nMult' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:663:5: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGLF/Tasks/QC/mcParticlePrediction.cxx:675:5: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGLF/Utils/inelGt.h:117:11: error: using integer absolute value function 'abs' when argument is of floating point type [clang-diagnostic-absolute-value,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 31 -gt 0 ]]
++ exit 1
--

Full log here.