VSCode renderer background not changing with style

## 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

Start by reproducing the issue in the VS Code renderer with a dark plot style, then read the related matplotlib/ipympl issue for context. The work is done when the renderer background matches the normal VS Code background or the selected plot style consistently.

Written by the indexing model from the issue text.