Also testing for SimulateCavern for EtaPhiFilter

At the request of @menke , adding a test for the simulate cavern flag before adding the eta/phi filter. I can't think of any situation in which we would want to simulate the cavern but we would not want to simulate forwward particles. After discussion with @jchapman , he agreed with the addition.

Simulation/ISF/ISF_Core/ISF_Services/python/ISF_ServicesConfig.py

@@ -90,7 +90,8 @@ def getGenParticleFilters():
         from AthenaCommon.BeamFlags import jobproperties
         if jobproperties.Beam.beamType() != "cosmics":
             genParticleFilterList += ['ISF_ParticlePositionFilterDynamic']
-            if (not simFlags.CavernBG.statusOn) or simFlags.CavernBG.get_Value() == 'Signal':
+            if (not simFlags.CavernBG.statusOn or simFlags.CavernBG.get_Value() == 'Signal') and\
+               not (simFlags.SimulateCavern.statusOn and simFlags.SimulateCavern.get_Value()):
                 genParticleFilterList += ['ISF_EtaPhiFilter']
     genParticleFilterList += ['ISF_GenParticleInteractingFilter']
     return genParticleFilterList