DQMOffline_Trigger_cosmics_cff.py: remove unused modules from the HLT DQM configuration

brings DQMOffline_Trigger_cosmics_cff.py in line with DQMOffline_Trigger_cosmics.py
Merge pull request #5283 from fwyzard/cleanup_DQMOffline_Trigger_cosmics_cff

DQMOffline_Trigger_cosmics_cff.py:  clean up