linestring在endEdit()后绘制不正确

**maptalks's version and what browser you use?**
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1、点击开始编辑按钮
2、拖动地图上的linestring
3、会残留一个圆圈
[debug.zip](https://github.com/maptalks/maptalks.js/files/13472892/debug.zip)


**Issue description**
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**Please provide a reproduction URL (on any jsfiddle like site)**
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