🐛 [BUG] 自定义 legend marker 某些 symbol 显示不正确

### 🐛 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**:
* [Demo](https://codesandbox.io/s/amazing-dream-wri79c?file=/index.ts:580-641)

### 🏞 Expected result

### 🚑 Any additional [like screenshots]

* **G2Plot Version**:
* **Platform**:
* 异常显示

G2 正确显示

已知显示异常的内置 symbol：`line` `hexagon` `bowtie` `cross` `tick` `plus` `hyphen`

Open the linked CodeSandbox minimal reproduction and inspect the custom legend marker configuration in index.ts. Compare the rendering of the listed symbols—line, hexagon, bowtie, cross, tick, plus, and hyphen—with the supplied screenshots and G2's correct display. Done means the affected built-in symbols render correctly in the reproduction.

Written by the indexing model from the issue text.