fix: 🐛 Dropdown icon margin style

[afc163]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

close #22274

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Dropdown icon missing margin.
🇨🇳 Chinese	修复 Dropdown 下拉菜单图标间距丢失的问题。

☑️ 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]

[ant-design-bot]

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit ad2f69b:

Sandbox	Source
antd reproduction template	Configuration
antd-dropdown-menu-icon-styles-bug	Issue #22274

[codecov]

Codecov Report

Merging #27165 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master    #27165   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          388       388           
  Lines         7394      7394           
  Branches      2064      2071    +7     
=========================================
  Hits          7394      7394           

---

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 771352c...ad2f69b. Read the comment docs.

[github-actions]

Size Change: +41 B (0%)

Total Size: 791 kB

Filename	Size	Change
./dist/antd.compact.min.css	66.3 kB	+15 B (0%)
./dist/antd.dark.min.css	67.6 kB	+11 B (0%)
./dist/antd.min.css	66.4 kB	+15 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
./dist/antd-with-locales.min.js	313 kB	0 B
./dist/antd.min.js	277 kB	0 B

_{compressed-size-action}

[lich-yoo]

@afc163 这个问题又改回来了