MuonEvenTPCnv - Fix unit test

Closes ATLASRECTS-7989

added full-unit-tests label

This merge request affects 1 package:

• MuonSpectrometer/MuonDetDescr/MuonReadoutGeometry

This merge request affects 2 files:

• MuonSpectrometer/MuonDetDescr/MuonReadoutGeometry/MuonReadoutGeometry/MMReadoutElement.h
• MuonSpectrometer/MuonDetDescr/MuonReadoutGeometry/src/MMReadoutElement.cxx

Adding @apsallid ,@rosati ,@kluit ,@pscholer ,@stavrop ,@jojungge as watchers

added MuonSpectrometer main review-pending-level-1 labels

✅ CI Result SUCCESS (hash c3c98389)

	Athena	AthSimulation
externals	✅	✅
cmake	✅	✅
make	✅	✅
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
📝 For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 9295] (remote access info)

added review-approved label

removed review-pending-level-1 label

merged

mentioned in commit dc438fb0

mentioned in merge request !71255 (merged)