Turning off GitHub Extension doesn't do anything

[mathewleeza]

Toggling off Dev Home GitHub Extension (Preview) under Settings -> Extensions, doesn't work. The widgets are still available and working properly even though as an end user I'd expect them to no longer be listed until I toggle it back on

Feel free to close as dupe of 44118901 if there's nothing else to do here besides disable widgets.

[krschau]

Duplicate of microsoft/devhome#1892