🐛 [BUG] 【annotations -- 辅助线】位置不对

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

配置如下：
{
start: ['min','mean'],
end: ['max','mean']
}
效果如下图，期望效果是 辅助线可以从最左边一直到最右边


* **G2Plot Version**:
* **Platform**:

Start by reproducing the supplied annotations configuration in G2Plot and compare the rendered auxiliary line with the attached screenshot. Trace the annotation rendering entry point to determine why the line does not span the full chart width; done means the configured line extends from the far left to the far right.

Written by the indexing model from the issue text.