雷达图使用<Tooltip /> defaultItem 线条指向错误

- [ ] I have searched the [issues](https://github.com/antvis/f2/issues) of this repository and believe that this is not a duplicate.

### Reproduction link
[https://stackblitz.com/edit/react-vmdpgh-5vyokg?file=index.js](https://stackblitz.com/edit/react-vmdpgh-5vyokg?file=index.js)

### Steps to reproduce
修改 中 defaultItem 值为 data 数据中 value 为 0 的时候，如 data[2] { time: '纠纷', value: 0, name: '本店' }, tooltip 线条指向了 data[0]。

| Environment | Info |
|---|---|
| f2 | 4.0.42 |
| System | - |
| Browser | - |

Start with the linked StackBlitz reproduction and inspect the radar chart Tooltip handling for defaultItem selection when the selected data point has value 0. Compare data[2] with data[0] and trace how the tooltip line target is chosen. Done means the line points to the requested zero-value item without changing the behavior of other radar data points.

Written by the indexing model from the issue text.