fix: dropdown item use max width

[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
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• Other (about what?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Adjust Dropdown item content style to make it get more display space.
🇨🇳 Chinese	调整 Dropdown 条目宽度，使其展示时尽可能多的利用空间。

☑️ 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
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[github-actions]

[codecov]

Codecov Report

Merging #30911 (31d323c) into master (cedf59c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master    #30911   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          397       397           
  Lines         7549      7549           
  Branches      2123      2123           
=========================================
  Hits          7549      7549           

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[github-actions]

Size Change: +1 B (0%)

Total Size: 830 kB

Filename	Size	Change
./dist/antd.dark.min.css	65.3 kB	+2 B (0%)
./dist/antd.min.css	64.1 kB	-1 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
./dist/antd-with-locales.min.js	340 kB	0 B
./dist/antd.compact.min.css	63.9 kB	0 B
./dist/antd.min.js	297 kB	0 B

_{compressed-size-action}

[dh336699]

之前是用的4.13版本，你们这版改了样式，Dropdown样式就出问题了

[xrkffgg]

之前是用的4.13版本，你们这版改了样式，Dropdown样式就出问题了

新开个 issue 吧