Fix AthAnalysis 21.2 warnings
Do not know how much we care but we have these
WARNING duplicated property name 'WeightDecorationName', see https://its.cern.ch/jira/browse/GAUDI-1023
WARNING duplicated property name 'TMVAConfigFile', see https://its.cern.ch/jira/browse/GAUDI-1023
Seen also in the wild !62086 (merged), !61972 (merged)
This tries to fix them ping @akraszna