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Remove FATRAS for MS from ATLFASTIIF_G4MS

Vincent Pascuzzi requested to merge vpascuzz/athena:21p3.ISF_MainConfig-ATLFASTIIF_G4MS.fix into 21.3

ATLFASTIIF_G4MS is supposed to use G4 in the MS, not FATRAS. This patch removes ISF_MuonFatrasSelector from CaloSimulationSelectors, improving level agreement between ATLFASTII and ATLFASTIIF_G4MS physics results (with only a small hit in processing time); see here for plots.

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