InDetDetDescrExample: Add missing const qualifier.

Fixes thread-checker warning.

Jenkins please retry a build

This merge request affects 1 package:

• InnerDetector/InDetExample/InDetDetDescrExample

Adding @goetz ,@sroe as watchers

added InnerDetector master review-pending-level-1 labels

CI Result SUCCESS (hash 993b2c18)

	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 1
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 11928]

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

merged

mentioned in commit b55a61e9

added sweep:ignore label