fix: scrollbar measure should consider scrollbar-color::webkit-scrollbar mixing

[zombieJ]

css 设置 scrollbar-color 后会导致 ::webkit-scrollbar 伪类失效。测量仍然使用 ::webkit-scrollbar 的数值导致滚动条宽度的计算错误。修复成实际测量值。

[vercel]

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Name	Status	Preview	Updated (UTC)
util	✅ Ready (Inspect)	Visit Preview	Mar 6, 2024 6:37am

[codecov]

Codecov Report

Attention: Patch coverage is 69.04762% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 90.48%. Comparing base (871c2c1) to head (307c616).

Files	Patch %	Lines
src/getScrollBarSize.tsx	69.04%	13 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## master #507 +/- ##
==========================================
- Coverage 91.58% 90.48% -1.11% 
==========================================
Files 38 38 Lines 927 935 +8 Branches 287 295 +8 ==========================================
- Hits 849 846 -3 - Misses 76 87 +11 
Partials 2 2 

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[crazyair]

69.04

[zombieJ]

69.04

测试盖不住，jsdom 没有真实的 DOM 环境。测试里写的也是假的。