fix: remove platform check in theme on web

[Xazin]

Closes: #89

[codecov]

Codecov Report

Merging #91 (ef12ee5) into main (30f231a) will decrease coverage by 0.06%.
The diff coverage is 37.50%.

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
- Coverage   86.85%   86.80%   -0.06%     
==========================================
  Files         125      125              
  Lines        7374     7381       +7     
==========================================
+ Hits         6405     6407       +2     
- Misses        969      974       +5     

Impacted Files	Coverage Δ
lib/src/service/shortcut_event/shortcut_event.dart	55.31% <0.00%> (-6.59%)	⬇️
lib/src/render/style/editor_style.dart	100.00% <100.00%> (ø)

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[LucasXu0]

To prevent this issue from happening again, we should also run our tests on the web.