🤔 [QUESTION] 图例点击隐藏一个，滚动条并未跟随数据发生变化

### 🐛 Question description [Please make everyone to understand it]
点击一个图例，隐藏该图例下的所有元素，数据量变少，滚动条仍旧保持原样


### 💻 Link to minimal reproduction

Please provide a link by forking these links [g2plot](https://codesandbox.io/s/g2plot-reproduction-template-gyej1) or GitHub repo. What is a minimal reproduction, and why is it required?

### 🏞 Expected result
点击一个图例，隐藏该图例下的所有元素，数据量变少后，滚动条高度能响应式
### 🚑 Any additional [like screenshots]

* **G2Plot Version**:
"@antv/g2plot": "^2.3.40",
* **Platform**:

Start with the G2Plot reproduction template linked in the issue and reproduce the legend-click behavior using G2Plot 2.3.40. Trace how legend filtering affects the chart data and scrollbar, then verify that the scrollbar height responds when a legend hides its elements.

Written by the indexing model from the issue text.