Gnome 41 related

[geoph9]

These issues were in a review of the extension by @JustPerfection in e.g.o.:

1. Also do this on disable:
   hassExtension = null;

2. Lang is a deprecated module. Please remove it for the next version:
   https://gjs.guide/extensions/review-guidelines/review-guidelines.html#general-advice
   Learn how to remove Lang from your code:
   https://gjs.guide/guides/gjs/legacy-class-syntax.html

[jrahmatzadeh]

Also remove getSettings from utils.js. Use ExtensionUtils.getSettings() instead. and remove unnecessary lines here and here. When you have this line in metadata.json file you don't need to send the parameter.

[geoph9]

Thank you for your help and pointers! These were all fixed in b318414