docs(troubleshooting): Remove workaround for "blur" plugin in KDE

[kelvie]

This reverts commit 8810c5c.

Appears this was fixed with the latest nvidia drivers or KDE 6.2, not sure which, but it's probably good to clean this page up.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.07%. Comparing base (39bab45) to head (3bc8405).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3363   +/-   ##
=======================================
  Coverage   11.06%   11.07%           
=======================================
  Files          99       99           
  Lines       17237    17237           
  Branches     8035     8035           
=======================================
+ Hits         1908     1909    +1     
  Misses      12784    12784           
+ Partials     2545     2544    -1     

Flag	Coverage Δ
Linux	8.35% <ø> (ø)
Windows	5.23% <ø> (ø)
macOS-13	13.63% <ø> (+0.01%)	⬆️
macOS-14	12.62% <ø> (ø)

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see 1 file with indirect coverage changes