fix: 修复DatePicker 预设范围的选择按钮样式

[xrkffgg]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

close #20758

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix button style for DatePicker's default range
🇨🇳 Chinese	修复DatePicker 预设范围的按钮样式

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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[codecov]

Codecov Report

Merging #20760 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #20760      +/-   ##
==========================================
+ Coverage   97.46%   97.47%   +<.01%     
==========================================
  Files         296      296              
  Lines        6877     6879       +2     
  Branches     1865     1865              
==========================================
+ Hits         6703     6705       +2     
  Misses        174      174

Impacted Files	Coverage Δ
components/tree/utils/iconUtil.tsx	88.88% <0%> (+1.38%)	⬆️

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