fix: rm useless form inline style

[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
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• Internationalization
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• Code style optimization
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🔗 Related issue link

fix #44251

💡 Background and solution

#17327 里重构 Form 搬了一些样式，之后 Form.Item 的 help 重构测量方法但是这里没有移除。

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Form inline layout show extra bottom margin when validation failed.
🇨🇳 Chinese	修复 Form inline 布局在校验失败时出现额外空行的问题。

☑️ 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 3ea55fd

Fix form item margin bug with inline style and help text. Remove unnecessary code from components/form/style/index.ts.

🔍 Walkthrough

🤖 Generated by Copilot at 3ea55fd

• Remove redundant margin for form items with inline style and help text (link)

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[github-actions]

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size-limit report 📦

Path	Size
./dist/antd.min.js	388.23 KB (-5 B 🔽)
./dist/antd-with-locales.min.js	447.22 KB (-4 B 🔽)

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No change detected	-	Aug 22, 2023, 3:22 PM

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (24d055e) 100.00% compared to head (3ea55fd) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #44360   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          660       660           
  Lines        11230     11230           
  Branches      3039      3039           
=========================================
  Hits         11230     11230           

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

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