Reduce redundant calls to mod_angle method in Angle type

[sdhiscocks]

No description provided.

[codecov]

Codecov Report

Merging #710 (7cb5f7d) into main (5276c1b) will decrease coverage by 0.01%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main     #710      +/-   ##
==========================================
- Coverage   94.62%   94.61%   -0.02%     
==========================================
  Files         172      172              
  Lines        8845     8854       +9     
  Branches     1714     1719       +5     
==========================================
+ Hits         8370     8377       +7     
- Misses        343      345       +2     
  Partials      132      132              

Flag	Coverage Δ
integration	70.30% <62.50%> (-0.08%)	⬇️
unittests	90.78% <81.25%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
stonesoup/types/angle.py	94.53% <87.50%> (-1.27%)	⬇️

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