No need to show the FullRepresentation to figure out the status of the
plasmoid.
Moves the code back to the main.qml file so that we're always tracking if
there's actually paired devices.
REVIEW: 122912
Provide a good initial size
Use compact representation when on a panel, full when on the desktop (this
prevented the icon to show on the system tray).
Reviewed by Albert Vaca
