MuonSensitiveDetectorsR4: fixed clang warnings

Unused variable

This merge request affects 1 package:

• MuonSpectrometer/MuonPhaseII/MuonG4/MuonSensitiveDetectorsR4

This merge request affects 2 files:

• MuonSpectrometer/MuonPhaseII/MuonG4/MuonSensitiveDetectorsR4/src/RpcSensitiveDetector.cxx
• MuonSpectrometer/MuonPhaseII/MuonG4/MuonSensitiveDetectorsR4/src/TgcSensitiveDetector.cxx

Adding @pscholer ,@jojungge ,@wleight ,@ddicroce ,@apsallid ,@markowen ,@stavrop ,@kluit ,@mvozak as watchers

added MuonSpectrometer Simulation Upgrade main review-pending-level-1 labels

CI Result SUCCESS (hash b4707a89)

	Athena	AthSimulation
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output (remote access info)

removed review-pending-level-1 label

added review-approved label

mentioned in commit 0428ae6c

merged