ATLASRECTS-6765: fix compilation by further cleanup

ATLASRECTS-6765: fix compilation by further cleanup

This merge request affects 1 package:

• InnerDetector/InDetValidation/InDetPhysValMonitoring

This merge request affects 2 files:

• InnerDetector/InDetValidation/InDetPhysValMonitoring/src/CachedGetAssocTruth.cxx
• InnerDetector/InDetValidation/InDetPhysValMonitoring/src/CachedGetAssocTruth.h

Adding @goetz ,@sroe as watchers

added InnerDetector master review-pending-level-1 labels

CI Result SUCCESS (hash 51a5fd89)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 44600]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit d3fb124f

added sweep:ignore label