Fix for COOKIE_MODE in settings.py

[SchrodingersGat]

Backport of #8262

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.50%. Comparing base (6c0f6e3) to head (4253686).
Report is 1 commits behind head on 0.16.x.

Additional details and impacted files

@@            Coverage Diff             @@
##           0.16.x    #8268      +/-   ##
==========================================
- Coverage   83.50%   83.50%   -0.01%     
==========================================
  Files        1124     1124              
  Lines       50064    50064              
  Branches     1657     1657              
==========================================
- Hits        41805    41804       -1     
- Misses       7822     7823       +1     
  Partials      437      437              

Flag	Coverage Δ
backend	85.28% <100.00%> (-0.01%)	⬇️

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