🐛 [BUG] 多折线图表中，如果设置颜色后，在数据相同的情况下 后面的颜色展示优先级会提高到图层顶部

### 🐛 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.

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### 🏞 Expected result

### 🚑 Any additional [like screenshots]

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

The issue provides no minimal reproduction, reproduction steps, expected result, version, or platform details. Start by adding those details; only then locate the affected multi-line chart behavior and define completion as reproducing the color-layer ordering problem and verifying its correction.

Written by the indexing model from the issue text.