fix: fix button fontSize token ineffective

[wanpan11]

中文版模板 / Chinese template

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🔗 Related issue link

• fix 使用 ConfigProvider 修改 Dropdown 下 Button 字体大小不生效 #47554

💡 Background and solution

Dropdown 下 Button 自定义 fontSize 无效

📝 Changelog

Language	Changelog
🇺🇸 English	fix Button fontSize token ineffective
🇨🇳 Chinese	修复 Button 字体大小 token 无效

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👁 Visual Regression Report for PR #48893 Passed ✅

🎯 Target branch: master (d47f9d2)
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All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d47f9d2) to head (fa6d28c).

Additional details and impacted files

@@            Coverage Diff            @@
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  Coverage   100.00%   100.00%           
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  Files          746       746           
  Lines        12994     12994           
  Branches      3411      3411           
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  Hits         12994     12994           

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