🐛 [BUG] 简单柱状图 同时设置 color（Function） 和 meta 后， meta 会失效

### 🐛 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**: 2.4.15
* **Platform**:

The report concerns a simple bar chart in G2Plot 2.4.15, but provides no reproduction link, steps, expected result, file, or test path. Start by creating a minimal reproduction that sets color as a function together with meta, then trace the bar-chart configuration and add a regression test showing that meta remains effective when the bug is fixed.

Written by the indexing model from the issue text.