Bugfix: Ensure negation of signals is reverted

[sandresen1]

after calculations

[codecov]

Codecov Report

Merging #1291 (d24331d) into develop (dd1087d) will increase coverage by 0.00%.
Report is 1 commits behind head on develop.
The diff coverage is 100.00%.

❗ Current head d24331d differs from pull request most recent head 7d0ea66. Consider uploading reports for the commit 7d0ea66 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1291   +/-   ##
========================================
  Coverage    74.24%   74.25%           
========================================
  Files           62       62           
  Lines         5548     5550    +2     
========================================
+ Hits          4119     4121    +2     
  Misses        1429     1429           

Files	Coverage Δ
macrosynergy/signal/signal_return_relations.py	96.39% <100.00%> (+0.01%)	⬆️