Remove pixel color checks from manual edit tests

[jacebrowning]

The pixel color checks are only used for waiting. The tests check for the expected code so that should be sufficient.

---

npm run test:playwright:electron -- --grep="manual edits during sketch mode" --repeat-each=10

Before: https://test-analysis-bot.hawk-dinosaur.ts.net/projects/KittyCAD/modeling-app/tests/461?branch=main

After: https://test-analysis-bot.hawk-dinosaur.ts.net/projects/KittyCAD/modeling-app/tests/461?branch=fix-manual-edits

[qa-wolf]

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Name	Status	Preview	Updated (UTC)
modeling-app	✅ Ready (Inspect)	Visit Preview	Apr 16, 2025 6:39pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.97%. Comparing base (e955e78) to head (3cb9f78).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6349   +/-   ##
=======================================
  Coverage   84.96%   84.97%           
=======================================
  Files         108      108           
  Lines       45599    45599           
=======================================
+ Hits        38745    38747    +2     
+ Misses       6854     6852    -2     

Flag	Coverage Δ
rust	84.97% <ø> (+<0.01%)	⬆️

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[jacebrowning]

See #6365