"Toggle Line Comment" (aka: cmd + /) Not Working

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* **Editor name and version**: VSCode v1.55.0
* **Platform**:
* **Color scheme**: default
* **MagicPython version**: v1.1.0
* **A sreenshot**:
* **5-10 lines of surrounding code**:


The issue I'm having is simple. I was using `Python` for VSCode without any issues but then started having code-coloring issues when using typings. I then installed "Python Extension Pack" (see below) which includes `MagicPython`, and when I try to run "cmd + /" or manually execute the command with "> Toggle Line Comment" it doesn't do anything.

I checked the keyboard shortcut and there is no conflicting shortcut as well as the keyboard shortcut is set correctly.

```
Name: Python Extension Pack
Id: donjayamanne.python-extension-pack
Description: Popular Visual Studio Code extensions for Python
Version: 1.6.0
Publisher: Don Jayamanne
VS Marketplace Link: https://marketplace.visualstudio.com/items?itemName=donjayamanne.python-extension-pack
```

Reproduce the failure in VSCode v1.55.0 with MagicPython v1.1.0 and the listed Python Extension Pack installed, using both cmd + / and the Toggle Line Comment command. Check how MagicPython declares Python comments and how VSCode selects the active language mode. Done means line comments toggle normally without a shortcut conflict.

Rédigé par le modèle d'indexation à partir du texte de l'issue.