fix(input-number): optimize rendering suffix slot judgment logic

[betavs]

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

Solution

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
input-number	优化渲染后缀插槽判断逻辑	optimize rendering suffix slot judgment logic	fix #2999

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

[codesandbox]

Review or Edit in CodeSandbox

Open the branch in Web Editor • VS Code • Insiders

Open Preview

[flsion]

@betavs 感谢 PR，这个是 suffix 插槽的样式问题，在 #3005 中修复了~