taro框架中使用时，图形画出来尺寸不对，设置pixelRatio也无效

- [ ] 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://github.com/kevin82008/tas-taro-f2](https://github.com/kevin82008/tas-taro-f2)

### Steps to reproduce
1. 执行yarn安装依赖
```
yarn add @tarojs/cli global
yarn
```

2. 执行 npm run dev 编译
```
npm run dev
```

3. 在微信小程序里查看效果

| Environment | Info |
|---|---|
| f2 | 4.0.29 |
| System | android |
| Browser | 微信小程序 |

Use the linked tas-taro-f2 reproduction project and begin by running yarn, npm run dev, then viewing the result in a WeChat mini program on Android. Compare the rendered chart dimensions with the intended size and verify whether pixelRatio changes the result; done means the chart renders at the correct dimensions in this environment.

Written by the indexing model from the issue text.