fix: revert skipped test for test_plot_design_face_colors

[RobPasMue]

Description

Random return order on faces and color assignment leads to inconsistently being able to plot faces with the color cycler and use images as refs. However, we will verify that the output image exists.

Issue linked

Closes #2265

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.53%. Comparing base (c719f67) to head (f218cf8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2266   +/-   ##
=======================================
  Coverage   94.53%   94.53%           
=======================================
  Files         163      163           
  Lines       11006    11006           
=======================================
  Hits        10405    10405           
  Misses        601      601           

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