style(tree): fix scrollheight calculation of inline-block element

[li1615882553]

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

修改前
tree组件的子节点前面存在一个缩进块，这是个空白的行内元素，内部会产生"幽灵空白节点"，导致树整体的scrollHeight大于clientHeight，最终在treeSelect的下拉中本不该产生滑动条的情况下产生了滑动条

修改后
修改行内元素的vertical-align，使scrollHeight计算正确

Solution

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
tree	修复scrollHeight计算异常问题	fix scrollHeight calculation exception problem

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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