Fix of HLT path name in validation code

The trigger HLT_PFMET110_PFMHT110_IDLoose_v1
has been changed in HLT_PFMET120_PFMHT120_IDLoose_v1.
(https://its.cern.ch/jira/browse/CMSHLT-186)

This PR fixes the new name in the validation code accordingly.

cc: @arizzi