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DerivationFrameworkMCTruth: Retrieve EventInfo instead of McEventInfo

Konstantin Lehmann requested to merge kolehman/athena:fix-EventInfo-retrieval-in-TruthMetaDataWriter into 21.2

Implementing a bugfix that was suggested in a PATHelp discussion here.

The EventInfo object isn't retrieved so that the mcChannelNumber is set to 0. This causes a runtime warning in the PMGTruthWeightTool, which expects a non-zero mcChannelNumber:

PMGTruthWeightTool WARNING MC channel number in TruthMetaData is invalid - assuming that channel 0 has the correct information.

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