AthMonitorAlgorithm already defines a property with name
eventInfoKey. To avoid clashes (and WARNING) rename the decoration key
to LArStatusFlag.
Fixes this type of warning in q442:
02:42:09 LArCollisionTimeMonAlg 0 WARNING duplicated property name 'eventInfoKey', see https://its.cern.ch/jira/browse/GAUDI-1023
02:42:09 LArClusterCollisionTimeMonAlg 0 WARNING duplicated property name 'eventInfoKey', see https://its.cern.ch/jira/browse/GAUDI-1023
02:42:09 larNoisyROMonAlg 0 WARNING duplicated property name 'eventInfoKey', see https://its.cern.ch/jira/browse/GAUDI-1023