[ATR-22277] Fix 'TrigConf__xAODMenuWriterMT' object has no attribute 'WritexAODMenuJSON' 🐛

Tim Martinrequested to merge
tamartin/athena:trigConfPythonNaming into master

Python naming 🐛 introduced by accident in large MR !37159 (merged) from yesterday.

Marking bugfix

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