RecExCommon: remove obsolete uses of TriggerFlags

Frank Winklmeierrequested to merge
fwinkl/athena:recex_tf into master

Two independent changes to remove uses of TriggerFlags:

  • Remove TriggerFlags from RecoUsefulFlags.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.

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