VSCode renderer background not changing with style

还没有人认领这个 Issue。

## Describe the issue

switched to dark plot style, background isn't changing. Ideally it would just match the normal vscode background, but copying the plot style would work too



## Versions

```
3.9.12 (main, Apr 4 2022, 05:22:27) [MSC v.1916 64 bit (AMD64)]
ipympl version: 0.9.2

Selected Jupyter core packages...
IPython : 7.30.1
ipykernel : 6.6.1
ipywidgets : 7.7.0
jupyter_client : 7.1.0
jupyter_core : 4.9.1
jupyter_server : not installed
jupyterlab : not installed
nbclient : 0.6.4
nbconvert : 6.5.0
nbformat : 5.4.0
notebook : 6.4.12
qtconsole : not installed
traitlets : 5.5.0

Known nbextensions:
config dir: C:\Users\TeamD\.jupyter\nbconfig
notebook section
jupyter-js-widgets/extension enabled
config dir: C:\Users\TeamD\.conda\envs\subgame\etc\jupyter\nbconfig
notebook section
jupyter-matplotlib/extension enabled
jupyter-js-widgets/extension enabled
- Validating: ok
- Validating: ok
- Validating: ok

Jupyter command `jupyter-labextension` not found.
```

Maybe related?

https://github.com/matplotlib/ipympl/issues/25

首先，在使用深色绘图样式的 VS Code renderer 中复现该问题，然后阅读相关的 matplotlib/ipympl issue 以了解背景。当 renderer 的背景始终与正常的 VS Code 背景或所选绘图样式匹配时，工作就完成了。

由索引模型根据 Issue 内容生成。