Minor Tweaks to PolygonalRegion

[Eric-Vin]

Description

Minor tweaks to PolygonalRegion's __eq__ and hash functions.

Issue Link

N/A

Checklist

• I have tested the changes locally via pytest and/or other means
• I have added or updated relevant documentation
• I have autoformatted the code with black and isort
• I have added test cases (if applicable)

Additional Notes

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.34%. Comparing base (a34460a) to head (cd2e219).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #290   +/-   ##
=======================================
  Coverage   91.33%   91.34%           
=======================================
  Files          54       54           
  Lines       13524    13537   +13     
=======================================
+ Hits        12352    12365   +13     
  Misses       1172     1172           

Files	Coverage Δ
src/scenic/core/regions.py	87.28% <100.00%> (-0.13%)	⬇️

... and 7 files with indirect coverage changes

[dfremont]

Looks good, just a minor comment above.

[dfremont]

Looks great!