Unlock Bluetooth on Google Stadia's Controller (including a fix) + Pairing / Testing on Steam Deck

Google has unlocked the Bluetooth mode on the soon-to-be-defunct Google Stadia controller! Let's see what it looks like to do it - and fix an issue you may have run across if Chromium doesn't see your controller.

Finally, we'll pair it up and quickly test it on the Steam Deck!

BT Patch Site
https://stadia.google.com/controller/