🐛 [BUG]带有seriesField的雷达图连接点的连接顺序有问题

### 🐛 Bug description [Please make everyone to understand it]

https://codesandbox.io/s/wizardly-christian-03x61k?file=/index.ts

### 📷 Step to reproduce

### 🏞 Expected result

我的例子中期望的连接顺序是 中南-华东-东北-华北-西北-西南

实际的series：[技术]的顺序是 中南-华东-东北-西北-华北-西南

因此雷达图出现了弯折

### 🚑 Any additional [like screenshots]

* **G2Plot Version**: 2.4.25
* **Platform**: codesandbox

Start with the linked CodeSandbox at index.ts and reproduce the radar chart using G2Plot 2.4.25. Compare the actual series connection order with the expected 中南-华东-东北-华北-西北-西南 order; done means the [技术] series connects in that order without the bend.

Written by the indexing model from the issue text.