Fix get_noise_distributions: so far we got 'normal' everywhere due to…

[dweindl]

… wrong grouping

[codecov-io]

Codecov Report

Merging #147 into develop will decrease coverage by 0.06%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop     #147      +/-   ##
===========================================
- Coverage    72.17%   72.11%   -0.07%     
===========================================
  Files           12       12              
  Lines         1150     1151       +1     
  Branches       262      262              
===========================================
  Hits           830      830              
- Misses         272      273       +1     
  Partials        48       48

Impacted Files	Coverage Δ
petab/core.py	79.71% <0%> (-0.24%)	⬇️

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