fix(form-item): fix error message not display when help set

[seepine]

Types of changes

• New feature
• Bug fix
• Enhancement
• Component style change
• Typescript definition change
• Documentation change
• Coding style change
• Refactoring
• Test cases
• Continuous integration
• Breaking change
• Others

Background and context

#1381

Solution

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
form	修复当设置 help 时，rules 触发的错误信息不显示的问题	Fix the problem that the error message triggered by rules is not displayed when help is set	Close #1381

Checklist:

• Test suite passes (npm run test)
• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others
  should be submitted to main branch)

Other information