fix(input-number): fix readonly not working in button mode

[oljc]

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

在 mode 为 button 时 设置 readOnly 左右按钮依然可以控制数值变化

Solution

参考 react 版设计只读禁用按钮效果修复
https://github.com/arco-design/arco-design/blob/5cff5d656de60d763d6b2d7317b8a2b217728d88/components/InputNumber/style/index.less#L158-L163

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
input-number	修复左右按钮模式下只读属性不生效问题	fix readonly not working in button mode	Closes #3138

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

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