fix: 🐛 duplicated icons when Tree showLine is true

[afc163]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

close #20090

💡 Background and solution

      <Tree showIcon showLine defaultExpandedKeys={['0-0-0']} onSelect={this.onSelect}>
        <TreeNode title="parent 1" key="0-0">
          <TreeNode icon={<Icon type="form" />} title="parent 1-0" key="0-0-0">
            <TreeNode icon={<Icon type="form" />} title="leaf" key="0-0-0-0" />
            <TreeNode title="leaf" key="0-0-0-1" />
            <TreeNode title="leaf" key="0-0-0-2" />
          </TreeNode>
          <TreeNode title="parent 1-1" key="0-0-1">
            <TreeNode title="leaf" key="0-0-1-0" />
          </TreeNode>
          <TreeNode title="parent 1-2" key="0-0-2">
            <TreeNode title="leaf" key="0-0-2-0" />
            <TreeNode title="leaf" key="0-0-2-1" />
          </TreeNode>
        </TreeNode>
      </Tree>

fixed to

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Tree duplicated icons when showLine is true.
🇨🇳 Chinese	修复 Tree showLine 为 true 时展示多余图标的问题。

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

[tests-checker]

Could you please add tests to make sure this change works as expected?

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[codecov]

Codecov Report

Merging #20102 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #20102      +/-   ##
==========================================
+ Coverage   97.81%   97.81%   +<.01%     
==========================================
  Files         286      286              
  Lines        7737     7739       +2     
  Branches     2128     2177      +49     
==========================================
+ Hits         7568     7570       +2     
  Misses        169      169

Impacted Files	Coverage Δ
components/tree/Tree.tsx	97.05% <100%> (+0.18%)	⬆️

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[yoyo837]

showLine ? false : showIcon === false

[afc163]

cause #20192 and fixed in #20196