Fix missing EDMVersion flag rename in TrigMETMonitorAlgorithm.py

Rafal Bielskirequested to merge
patch-9 into master

Fix CI failures caused by conflicting merges: !38449 (merged) renaming a flag and !38875 (merged) adding a use case with the old name.

Fixes ATR-22499

MR submitted urgently using GitLab Web Editor - not tested locally.

cc @emoyse

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