MuonCondAlg: Fix invalid reads in TgcDigitTimeOffsetCondAlg and TgcDigitCrosstalkCondAlg

Alaettin Serhan Meterequested to merge
amete/athena:23.0-ATLASRECTS-7648 into 23.0

This should make valgrind happy...

Closes ATLASRECTS-7648

cc: @jchapman @tovsiann

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