Update the list of the muon path monitored according of the new HLT template menu

- The main part of this PR is the update of the list of paths to be monitored in the python configuration files
- In addition, some small changes in the c++ code have been performed to allow the single tracker muon path to be monitored

*The DQM file produced after including this PR can be found here:*
```
/afs/cern.ch/user/h/hbrun/public/DQMtests/DQM_V0001_R000000001__Global__CMSSW_X_Y_Z__RECO.root
```