fix: Form sm 24 not working

[zombieJ]

[中文版模板 / Chinese template]

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• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
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🔗 Related issue link

fix #44538

💡 Background and solution

v4 is correct https://github.com/ant-design/ant-design/blob/4.x-stable/components/form/style/horizontal.less#L18

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Form wrapperCol to be 24 not working when labelCol is set to 24.
🇨🇳 Chinese	修复 Form labelCol 设置为 24 时，会使 wrapperCol 设置 24 失效的问题。

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• 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

---

🚀 Summary

🤖 Generated by Copilot at 609c5d0

Fixed a form style bug and removed unused code in components/form/style/index.ts. The bug caused incorrect label alignment for some custom classes.

🔍 Walkthrough

🤖 Generated by Copilot at 609c5d0

• Fix form item control style for custom label class names that end with or contain -24 (link)
• Remove unused rootPrefixCls variable from genHorizontalStyle function (link)

[github-actions]

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size-limit report 📦

Path	Size
./dist/antd.min.js	389.52 KB (+13 B 🔺)
./dist/antd-with-locales.min.js	448.38 KB (+16 B 🔺)

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Build	Status	Details	Updated (UTC)
default (Inspect)	🧿 Changes detected (Review)	1 change	Aug 30, 2023, 4:13 PM

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e88581c) 100.00% compared to head (0256315) 100.00%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #44541   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          665       665           
  Lines        11276     11304   +28     
  Branches      3048      3063   +15     
=========================================
+ Hits         11276     11304   +28     

Files Changed	Coverage Δ
components/form/style/index.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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