Fix text negative margins due to outdated TextBox styling class.

[Al12rs]

[codecov]

Codecov Report

Merging #749 (a159fd3) into main (b324e46) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #749      +/-   ##
==========================================
- Coverage   62.73%   62.69%   -0.04%     
==========================================
  Files         585      585              
  Lines       17422    17417       -5     
  Branches     1219     1219              
==========================================
- Hits        10930    10920      -10     
- Misses       6170     6178       +8     
+ Partials      322      319       -3     

Flag	Coverage Δ
Linux	61.93% <ø> (-0.04%)	⬇️
Windows	61.85% <ø> (-0.04%)	⬇️
clean_environment_tests	62.68% <ø> (-0.04%)	⬇️
network_tests	?

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Files	Coverage Δ
src/NexusMods.App.UI/Theme/TextBlockStyles.xaml	99.44% <ø> (-0.02%)	⬇️

... and 7 files with indirect coverage changes