Test for calendar not working

[cqc-melf]

=========================== short test summary info ============================
FAILED integration/backend_test.py::test_view_calendar - Failed: Error: Image files did not match.
  RMS Value: 18.37049824673608
  Expected:  
    /tmp/tmpn58n_kjt/backend_test.test_view_calendar/baseline.png
  Actual:    
    /tmp/tmpn58n_kjt/backend_test.test_view_calendar/result.png
  Difference:
    /tmp/tmpn58n_kjt/backend_test.test_view_calendar/result-failed-diff.png
  Tolerance: 
    2

[cqc-melf]

I think a viable solution would be to remove the test...