Fix units error in MultiHexagonAperture, see #485

[mperrin]

Fixes #485

[codecov]

Codecov Report

Base: 74.73% // Head: 74.84% // Increases project coverage by +0.10% 🎉

Coverage data is based on head (568fc7c) compared to base (7d3e3bf).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #527      +/-   ##
===========================================
+ Coverage    74.73%   74.84%   +0.10%     
===========================================
  Files           18       18              
  Lines         6476     6499      +23     
===========================================
+ Hits          4840     4864      +24     
+ Misses        1636     1635       -1     

Impacted Files	Coverage Δ
poppy/optics.py	81.91% <100.00%> (+0.02%)	⬆️
poppy/wfe.py	81.27% <0.00%> (+0.03%)	⬆️
poppy/poppy_core.py	80.94% <0.00%> (+0.04%)	⬆️
poppy/sub_sampled_optics.py	67.41% <0.00%> (+0.14%)	⬆️
poppy/dms.py	46.40% <0.00%> (+0.27%)	⬆️
poppy/fresnel.py	84.92% <0.00%> (+0.35%)	⬆️
poppy/instrument.py	67.66% <0.00%> (+0.37%)	⬆️

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