hover 图例的时候柱子上会产生一个黑色框 🐛 [BUG]

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

> Please provide a link by forking these links [G2Plot](https://codesandbox.io/s/g2plot-issue-template-gzfdq?file=/index.ts) or GitHub repo, a minimal reproduction.

* _Required_ **Link to minimal reproduction**:

### 📷 Step to reproduce

### 🏞 Expected result

### 🚑 Any additional [like screenshots]

* **G2Plot Version**: 2.4.31,
* **Platform**: 堆叠柱状图渲染出来后,在hover 图例的时候 相应的柱子上会产生一个黑色的边框

Start with the linked G2Plot issue template and reproduce the behavior using version 2.4.31 with a stacked bar chart. Investigate the legend-hover interaction and compare the rendered bars before and during hover; the issue is complete when hovering a legend no longer produces an unwanted black border.

Written by the indexing model from the issue text.