style: remove some useless tree style

[erha19]

Types

• 💄 Style Changes

Background or solution

移除了不同视图下的冗余样式，修复 Marker / OpenedEditor 等面板在 Light+ 主题下异常展示问题

fixed #2179

Changelog

remove some useless tree style

[codecov]

Codecov Report

Base: 57.77% // Head: 57.79% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (3f9e738) compared to base (144720e).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2186      +/-   ##
==========================================
+ Coverage   57.77%   57.79%   +0.01%     
==========================================
  Files        1315     1315              
  Lines       83050    83038      -12     
  Branches    17291    17291              
==========================================
+ Hits        47986    47990       +4     
+ Misses      31867    31851      -16     
  Partials     3197     3197              

Flag	Coverage Δ
jsdom	52.74% <0.00%> (+0.01%)	⬆️
node	16.50% <0.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...line/src/browser/services/outline-model.service.ts	55.41% <ø> (-0.29%)	⬇️
...onents/scm-resource-tree/scm-tree-model.service.ts	11.76% <0.00%> (+0.17%)	⬆️
...ser/components/scm-resource-tree/scm-tree-model.ts	42.85% <ø> (+6.01%)	⬆️
packages/utils/src/buffer.ts	33.72% <0.00%> (+4.06%)	⬆️

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