Fix for Online DQ crashes
This commit fixes the issue reported in the Jira Ticket https://its.cern.ch/jira/browse/ATLASRECTS-8133.
The fix consists in removing superfluous histogram declarations in MuonTrackMonitorAlgorithm.py that are being defined in the postprocessing aswell and adjusting the postprocessing configuration in MuonTrackMon.yaml accordingly. A number of typos in MuonTrackMonitorAlgorithm.py lead to histograms not being properly created and therefore fixed aswell.
The procedure to reproduce the crash described in the ticket now terminates without a crash or error.