Fix angular uncertainty

[specktakel]

• Removed the erroneous conversion of angular uncertainties from 50% to 1sigma.
• Changed spatial likelihood to Rayleigh pdf on a sphere
• Fixed some if-clause comparing an instance with a type
• Formatting

[codecov]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (f6295ec) 55.33% compared to head (e47e383) 55.33%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
icecube_tools/detector/r2021.py	81.03%	11 Missing ⚠️
...ols/point_source_analysis/point_source_analysis.py	0.00%	2 Missing ⚠️
...ools/point_source_likelihood/spatial_likelihood.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   55.33%   55.33%           
=======================================
  Files          24       24           
  Lines        4384     4384           
=======================================
  Hits         2426     2426           
  Misses       1958     1958           

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