Adapt MTCalibPebConfig to changes in DecisionSummaryMakerAlg properties

Rafal Bielskirequested to merge
rbielski/athena:fix-calibpeb-summarymaker into master

The type of the property FinalStepDecisions of DecisionSummaryMakerAlg was changed in !38685 (merged) from map<string,string> to map<string,vector<string>>, but the client configuration in MTCalibPebConfig.py was not updated. This caused very obscure errors in property parsing, but the fix is trivial.

Fixes ATR-22494

Edited by Rafal Bielski

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