style: apply pre-commit

[steven-murray]

Fixes some pre-commit issues that came up in a previous PR

[codecov]

Codecov Report

Base: 68.82% // Head: 71.95% // Increases project coverage by +3.13% 🎉

Coverage data is based on head (2bb9886) compared to base (1205d05).
Patch coverage: 61.53% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   68.82%   71.95%   +3.13%     
==========================================
  Files           8        8              
  Lines        1764     1765       +1     
==========================================
+ Hits         1214     1270      +56     
+ Misses        550      495      -55     

Impacted Files	Coverage Δ
src/py21cmmc/likelihood.py	62.13% <ø> (+2.19%)	⬆️
src/py21cmmc/core.py	67.67% <50.00%> (ø)
src/py21cmmc/mcmc.py	90.62% <100.00%> (+29.20%)	⬆️
src/py21cmmc/cosmoHammer.py	89.90% <0.00%> (+0.68%)	⬆️

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