Change style for disabled simulation modes

[andreas-el]

Issue
Resolves #8531

⚠️ I set simulation modes containing the word "experiment" as disabled for this test;

Video shows both light and dark mode effects.

Screen.Recording.2024-08-21.at.14.43.44.mov

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure tests pass locally (after every commit!)

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.75%. Comparing base (31d3aa2) to head (e5c5200).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...rc/ert/gui/simulation/combobox_with_description.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8541      +/-   ##
==========================================
- Coverage   90.76%   90.75%   -0.01%     
==========================================
  Files         342      342              
  Lines       20935    20937       +2     
==========================================
+ Hits        19001    19002       +1     
- Misses       1934     1935       +1     

Flag	Coverage Δ
gui-tests	75.86% <25.00%> (+0.02%)	⬆️
integration-tests	53.97% <0.00%> (+0.02%)	⬆️
unit-tests	68.77% <0.00%> (-0.01%)	⬇️

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[eivindjahren]

💯