Fix MuonId error in dump-geo config and set R3 tag as the default geometry

This MR fixes the crash of dump-geo in main due to a misconfiguration of MuonId.

This MR also updates the default geometry tag to the R3 tag: ATLAS-R3S-2021-03-01-00.

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You can run/test dump-geo with:

1. Without arguments

dump-geo

this will dump the default geometry tag, currently, the ATLAS-R3S-2021-03-01-00

2. By specifying a given geometry tag with the -detdescr option:

dump-geo -detdescr=ATLAS-R2-2016-01-00-01

this will dump the ATLAS-R2-2016-01-00-01 geometry tag