Fixes problem with ContinuousSpace.get_heading in toroidal space mode

[senden9]

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See issue projectmesa/mesa#943

It is for sure not a beautiful fix but it works for my use-case.

[codecov[bot]]

Codecov Report

Merging #944 into master will increase coverage by 0.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #944      +/-   ##
==========================================
+ Coverage   88.86%   88.96%   +0.09%     
==========================================
  Files          19       19              
  Lines        1132     1142      +10     
  Branches      189      192       +3     
==========================================
+ Hits         1006     1016      +10     
  Misses         92       92              
  Partials       34       34              

Impacted Files	Coverage Δ
mesa/space.py	96.45% <100.00%> (+0.11%)	:arrow_up:

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[senden9]

Closed in the interest of #1664.