Hackbot should not change the commit author when updating a patch

[suhaibmujahid]

The author info in the new diff should match what we have already on the previous diff.

[suhaibmujahid]

Here where we add the commit info:

bugbug/libs/hackbot-runtime/hackbot_runtime/actions/handlers/phabricator_handler.py

Lines 280 to 287 in 88b1368

	await _set_local_commits(
	diff_result["diffid"],
	submission["local_commits"],
	fields.get("title") or f"D{revision_id}",
	fields.get("summary"),
	fields.get("bugzilla.bug-id"),
	revision_id,
	)