style(dropdown): the label is not aligned

[ikxin]

Types of changes

• New feature
• Bug fix
• Enhancement
• Component style change
• Typescript definition change
• Documentation change
• Coding style change
• Refactoring
• Test cases
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• Breaking change
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Background and context

当 Dropdown 组件的 Dsubmenu 内容长度不一致时标签没有对齐 #3057

Solution

将 Dsubmenu 元素中的标签元素宽度设置为 100%

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
dropdown	修复标签未对齐	fix the label is not aligned	#3057

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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[oljc]

@ikxin
使用选择器 如果没有设置图标时 suffix 将变成第二个 span 元素导致与预期不符：

希望有空改一下这个 PR，使用 flex 1，此外参考其他已合并 PR 完善补充一下 Changelog😀

[ikxin]

@LIjiAngChen8 感谢建议，已更新 pr