DQM: Adding protections for runs with 21 masked pixels (due to shutter)

[hashkar]

The camera geometry was already fixed. This pull request has small bug and style fixes

[codecov]

Codecov Report

Attention: 74 lines in your changes are missing coverage. Please review.

Comparison is base (39b677b) 5.61% compared to head (c138ae5) 5.64%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master     #80      +/-   ##
=========================================
+ Coverage    5.61%   5.64%   +0.02%     
=========================================
  Files          37      37              
  Lines        3667    3649      -18     
=========================================
  Hits          206     206              
+ Misses       3461    3443      -18     

Files	Coverage Δ
src/nectarchain/dqm/trigger_statistics.py	0.00% <0.00%> (ø)
src/nectarchain/dqm/dqm_summary_processor.py	0.00% <0.00%> (ø)
src/nectarchain/dqm/start_calib.py	0.00% <0.00%> (ø)
src/nectarchain/dqm/mean_camera_display.py	0.00% <0.00%> (ø)
src/nectarchain/dqm/charge_integration.py	0.00% <0.00%> (ø)
src/nectarchain/dqm/camera_monitoring.py	0.00% <0.00%> (ø)
src/nectarchain/dqm/mean_waveforms.py	0.00% <0.00%> (ø)

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[jlenain]

Hi @hashkar !
Thanks a lot !
I performed some tests on a few runs, all good on my side !

[jlenain]

Was a follow-up of #63