style: optimization select dropdown group RTL style

[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

• 非拆分

📝 Changelog

Language	Changelog
🇺🇸 English	optimization select dropdown group RTL style
🇨🇳 Chinese	优化 Select group RTL 下的显示

☑️ 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]

[codecov]

Codecov Report

Merging #22584 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22584   +/-   ##
=======================================
  Coverage   98.14%   98.14%           
=======================================
  Files         306      306           
  Lines        7078     7078           
  Branches     1946     1946           
=======================================
  Hits         6947     6947           
  Misses        131      131

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 75a10e3...0b1027e. Read the comment docs.