Drop keyless retrieve of xAOD::EventInfo in CscDigitizationTool

John Derek Chapmanrequested to merge
jchapman/athena:CSC_Digitization_evtStore_master into master

CscDigitizationTool was retrieving an xAOD::EventInfo object from the evtStore and storing the event and run numbers in member variables. These values were only used in two DEBUG messages.

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