Fix warnings in G4SamplingCaloTest

...4Tests/G4SamplingCaloTest/include/ActionInitialization.hh

...4Tests/G4SamplingCaloTest/include/DetectorConstruction.hh

LHCbG4Tests/G4SamplingCaloTest/include/DetectorMessenger.hh

LHCbG4Tests/G4SamplingCaloTest/include/EventAction.hh

LHCbG4Tests/G4SamplingCaloTest/include/PhysListEmStandard.hh

LHCbG4Tests/G4SamplingCaloTest/include/PhysicsList.hh

...4Tests/G4SamplingCaloTest/include/PhysicsListMessenger.hh

...ests/G4SamplingCaloTest/include/PrimaryGeneratorAction.hh

...s/G4SamplingCaloTest/include/PrimaryGeneratorMessenger.hh

LHCbG4Tests/G4SamplingCaloTest/include/Run.hh

LHCbG4Tests/G4SamplingCaloTest/include/RunAction.hh

LHCbG4Tests/G4SamplingCaloTest/include/StepMax.hh

LHCbG4Tests/G4SamplingCaloTest/include/StepMaxMessenger.hh

LHCbG4Tests/G4SamplingCaloTest/include/SteppingAction.hh

LHCbG4Tests/G4SamplingCaloTest/include/SteppingVerbose.hh

LHCbG4Tests/G4SamplingCaloTest/include/TrackingAction.hh