Restart Promted & Wrong Profile Indicated when User Authentication is Canceled

[ledex]

When changing the GPU profile and canceling the authentication, the user is still promoted to restart the system and the current GPU profile is indicated wrong. Switching from Hybrid to Nvidia for example and then canceling the authentication modal has the result that the GPU mode indicated in the extension is now Nvidia (Reboot needed), even though the change did not take place.

Adding a check if the authentication was successful might be senseful.