fix(form-item): validate logic

[zkwolf]

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[中文版模板 / Chinese template]

This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Branch merge
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What's the background?

1. Describe the source of requirement.
2. Resolve what problem.
3. Related issue link.

API Realization (Optional if not new feature)

1. Basic thought of solution and other optional proposal.
2. List final API realization and usage sample.
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What's the effect? (Optional if not new feature)

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2. What will say in changelog?
3. Does this PR contains potential break change or other risk?

Changelog description (Optional if not new feature)

1. English description
2. Chinese description (optional)
   修复form-item不传递name属性时显示错误的验证结果的bug

Self Check before Merge

• Doc is updated/provided or not needed
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