InDetPhysValMonitoring: Fix clang warnings.

Unused private data members. (A couple left commented-out for documentation purposes.)

This merge request affects 1 package:

• InnerDetector/InDetValidation/InDetPhysValMonitoring

Adding @goetz ,@sroe as watchers

added InnerDetector master review-pending-level-1 labels

CI Result SUCCESS (hash e79cc885)

	Athena	AthSimulation	AnalysisBase	AthGeneration
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 13385]

merged

mentioned in commit 8b8798dc

added sweep:ignore label