style: improve file dialog tree style

[erha19]

Types

• 💄 Style Changes

Background or solution

before:

after:

Changelog

improve file dialog tree style

[codecov]

Codecov Report

Base: 57.59% // Head: 57.59% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (ac096ed) compared to base (fd9f031).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##            v2.20    #1770   +/-   ##
=======================================
  Coverage   57.59%   57.59%           
=======================================
  Files        1257     1257           
  Lines       78470    78470           
  Branches    16439    16439           
=======================================
+ Hits        45191    45195    +4     
+ Misses      30277    30274    -3     
+ Partials     3002     3001    -1     

Flag	Coverage Δ
jsdom	52.39% <ø> (+<0.01%)	⬆️
node	15.84% <ø> (ø)

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

Impacted Files	Coverage Δ
...kages/theme/src/browser/workbench.theme.service.ts	71.59% <0.00%> (+0.57%)	⬆️
...erences/src/browser/preference-settings.service.ts	75.62% <0.00%> (+0.62%)	⬆️
packages/monaco/src/browser/schema-registry.ts	71.11% <0.00%> (+2.22%)	⬆️

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