chore: remove activityBar badge border

[yantze]

Types

• 💄 Style Changes

Background or solution

Activity Bar 的 badge 加了 border 后分散注意力，2.20 是突然出现的，感觉可以去掉

Changelog

chore: 移除 Activity Bar 的 badge 的 border 样式

[codecov]

Codecov Report

Base: 57.57% // Head: 57.57% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (ac98579) compared to base (69ba8b8).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1856   +/-   ##
=======================================
  Coverage   57.57%   57.57%           
=======================================
  Files        1285     1285           
  Lines       80236    80236           
  Branches    16811    16811           
=======================================
+ Hits        46196    46198    +2     
+ Misses      30961    30960    -1     
+ Partials     3079     3078    -1     

Flag	Coverage Δ
jsdom	52.33% <ø> (+<0.01%)	⬆️
node	15.90% <ø> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
packages/utils/src/strings.ts	39.26% <0.00%> (-0.22%)	⬇️
...kages/theme/src/browser/workbench.theme.service.ts	71.75% <0.00%> (+0.57%)	⬆️
packages/monaco/src/browser/schema-registry.ts	71.11% <0.00%> (+2.22%)	⬆️

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