Fix warnings in G4MScInThinLayerTest

LHCbG4Tests/G4MScInThinLayerTest/CMakeLists.txt

...ests/G4MScInThinLayerTest/include/ActionInitialization.hh

...ests/G4MScInThinLayerTest/include/DetectorConstruction.hh

...G4Tests/G4MScInThinLayerTest/include/DetectorMessenger.hh

LHCbG4Tests/G4MScInThinLayerTest/include/EventAction.hh

...4Tests/G4MScInThinLayerTest/include/PhysListEmStandard.hh

...sts/G4MScInThinLayerTest/include/PhysListEmStandardSSM.hh

LHCbG4Tests/G4MScInThinLayerTest/include/PhysicsList.hh

...ests/G4MScInThinLayerTest/include/PhysicsListMessenger.hh

...ts/G4MScInThinLayerTest/include/PrimaryGeneratorAction.hh

...G4MScInThinLayerTest/include/PrimaryGeneratorMessenger.hh

LHCbG4Tests/G4MScInThinLayerTest/include/Run.hh

LHCbG4Tests/G4MScInThinLayerTest/include/RunAction.hh

LHCbG4Tests/G4MScInThinLayerTest/include/StackingAction.hh

...G4Tests/G4MScInThinLayerTest/include/StackingMessenger.hh

LHCbG4Tests/G4MScInThinLayerTest/include/StepMax.hh

LHCbG4Tests/G4MScInThinLayerTest/include/StepMaxMessenger.hh

LHCbG4Tests/G4MScInThinLayerTest/include/SteppingAction.hh

LHCbG4Tests/G4MScInThinLayerTest/include/SteppingVerbose.hh

LHCbG4Tests/G4MScInThinLayerTest/include/TrackingAction.hh