fix: not force fill auto

[zombieJ]

fix ant-design/ant-design#47754

Chrome 下，::-webkit-scrollbar 设置 width/height: atuo 与 style 默认的 width/height: atuo 行为不一致。显式设置会变成固定占位，而默认 auto 则不会。

PS: JSDOM 不能模拟这种情况

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Name	Status	Preview	Updated (UTC)
util	✅ Ready (Inspect)	Visit Preview	Mar 7, 2024 7:33am

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 89.90%. Comparing base (6253c1b) to head (508bd9c).

Files	Patch %	Lines
src/getScrollBarSize.tsx	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #508      +/-   ##
==========================================
- Coverage   90.48%   89.90%   -0.58%     
==========================================
  Files          38       38              
  Lines         935      941       +6     
  Branches      295      299       +4     
==========================================
  Hits          846      846              
- Misses         87       93       +6     
  Partials        2        2              

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