RecExCommon: remove obsolete uses of TriggerFlags
Two independent changes to remove uses of TriggerFlags:
- Remove
TriggerFlags
fromRecoUsefulFlags.py
as they are not useful anymore😆 (and that file itself is barely used anyway). - Delete
sync_Trigger2Reco
as the only remaining setting (enable trigger bytestream unpacking) is already applied explicitly in RecExCommon_topOptions.py.