Fix particle id guessing when loading data

[mikael10j]

removes the casting to set of the array of mc_particle as set is not subscriptable

[codecov]

Codecov Report

Patch coverage: 31.61% and project coverage change: +0.12 🎉

Comparison is base (eafbe37) 63.15% compared to head (b0140f4) 63.27%.

❗ Current head b0140f4 differs from pull request most recent head 0c2467a. Consider uploading reports for the commit 0c2467a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #195      +/-   ##
==========================================
+ Coverage   63.15%   63.27%   +0.12%     
==========================================
  Files          21       20       -1     
  Lines        2717     2715       -2     
==========================================
+ Hits         1716     1718       +2     
+ Misses       1001      997       -4     

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	11.86% <2.24%> (-0.05%)	⬇️
ctaplot/ana/ana.py	88.08% <86.66%> (-0.15%)	⬇️
ctaplot/ana/tests/test_ana.py	100.00% <100.00%> (ø)
ctaplot/plots/plots.py	78.46% <100.00%> (ø)
ctaplot/plots/tests/test_plots.py	98.73% <100.00%> (+0.07%)	⬆️

... and 1 file with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.