style: add search input border color in RTL

[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

none

💡 Background and solution

• https://ant.design/components/input-cn/#components-input-demo-search-input
• 打开链接，选择 RTL 模式，观察“搜索框”的后 2 个例子
• 鼠标 hover focus 没有显示 边框颜色

📝 Changelog

Language	Changelog
🇺🇸 English	add search input border color in RTL
🇨🇳 Chinese	add RTL 模式 search input 的 border 样式

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• 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

[ant-design-bot]

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[codecov]

Codecov Report

Merging #21946 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #21946   +/-   ##
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  Coverage   97.96%   97.96%           
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  Files         305      305           
  Lines        7017     7017           
  Branches     1934     1888   -46     
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  Hits         6874     6874           
  Misses        143      143

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