Fixed bug reading in multiple seasons' events

[specktakel]

Fixed bug where IC86_III and later would be read in if and only if IC86_II alone is queried with kwarg use_all==True

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (2707db6) 55.29% compared to head (f3959e9) 55.33%.
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
+ Coverage   55.29%   55.33%   +0.04%     
==========================================
  Files          24       24              
  Lines        4380     4384       +4     
==========================================
+ Hits         2422     2426       +4     
  Misses       1958     1958              

Files	Coverage Δ
icecube_tools/detector/r2021.py	81.66% <100.00%> (ø)
icecube_tools/utils/data.py	71.91% <88.88%> (+0.19%)	⬆️

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