fix: 修复树状模式当一组数据只有一条数据时, 叶子节点判断错误, 也渲染了展开/收起图标 close #2804

[lijinke666]

👀 PR includes

🐛 Bugfix

• Solve the issue and close 透视表树模式根节点没有后代也展示展开/收起图标 #2804

📝 Description

树状模式由于一级节点即是普通节点, 又是小计节点, 在当前分组下只有一条数据时, isLeaf 判断错误, 错误的展示了折叠展开 icon.

{
  "fields": {
    "rows": ["row0", "row1"],
    "columns": ["col0"],
    "values": ["cost"],
    "valueInCols": true
  },
  "data": [
    {
      "row0": "a-1",
      "col0": "b-1",
      "cost": 2
    },
    {
      "row0": "a-2",
      "row1": "a-2-1",
      "col0": "b-2",
      "cost": 3
    }
  ]
}

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• Add or update test case.
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Name	Status	Preview	Comments	Updated (UTC)
antvis-s2	❌ Failed (Inspect)			Jul 5, 2024 8:09am

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[lijinke666]

🎉 This PR is included in version @antv/s2-v1.55.7 🎉

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