Saving Bluetooth permission status in UserDefaults leads to crash

[alinradut]

Going through the regular Bluetooth permission workflow leads to the following crash:

[User Defaults] Attempt to set a non-property-list object Authorized as an NSUserDefaults/CFPreferences value for key permission.statusBluetooth
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attempt to insert non-property list object Authorized for key permission.statusBluetooth'

[kaiserabliz]

Check #149