fix: Dropdown selected keys

[zombieJ]

[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

resolve #30786

💡 Background and solution

看起来原本带图标的 Dropdown Item hover 到图标点击无法触发 a 效果，一并修了。有统一 className 后感觉代码量还少了？帮忙确认一下。

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Dropdown Item with link color style and click icon can also trigger link effect now.
🇨🇳 Chinese	修复 Dropdown 条目包含超链接时的颜色样式，另外现在点击图标也能触发超链接效果。

☑️ 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

[github-actions]

[codecov]

Codecov Report

Merging #30802 (6243939) into master (9f0dbf2) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master    #30802   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          397       397           
  Lines         7571      7543   -28     
  Branches      2123      2113   -10     
=========================================
- Hits          7571      7543   -28     

Impacted Files	Coverage Δ
components/tree-select/index.tsx	100.00% <0.00%> (ø)

---

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 9f0dbf2...6243939. Read the comment docs.

[github-actions]

Size Change: -247 B (0%)

Total Size: 830 kB

Filename	Size	Change
./dist/antd.compact.min.css	63.9 kB	-86 B (0%)
./dist/antd.dark.min.css	65.2 kB	-86 B (0%)
./dist/antd.min.css	64.1 kB	-75 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
./dist/antd-with-locales.min.js	340 kB	0 B
./dist/antd.min.js	297 kB	0 B

_{compressed-size-action}

[afc163]

修复 Dropdown 条目包含超链接的颜色样式以及现在点击图标也能触发超链接效果。

修复 Dropdown 条目包含超链接时的颜色样式，另外现在点击图标也能触发超链接效果。