fixing plot_resolution_difference bug

[vuillaut]

No description provided.

[codecov]

Codecov Report

Patch coverage: 33.33% and project coverage change: +0.04 🎉

Comparison is base (eafbe37) 63.15% compared to head (eaff1d8) 63.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
+ Coverage   63.15%   63.20%   +0.04%     
==========================================
  Files          21       21              
  Lines        2717     2734      +17     
==========================================
+ Hits         1716     1728      +12     
- Misses       1001     1006       +5     

Impacted Files	Coverage Δ
ctaplot/gammaboard/reader.py	0.00% <0.00%> (ø)
ctaplot/plots/style.py	100.00% <ø> (ø)
ctaplot/gammaboard/gammaboard.py	11.81% <2.27%> (-0.10%)	⬇️
ctaplot/ana/ana.py	88.20% <86.66%> (-0.03%)	⬇️
ctaplot/__init__.py	100.00% <100.00%> (ø)
ctaplot/ana/tests/test_ana.py	100.00% <100.00%> (ø)
ctaplot/plots/plots.py	78.49% <100.00%> (+0.02%)	⬆️
ctaplot/plots/tests/test_plots.py	98.73% <100.00%> (+0.07%)	⬆️

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