Don't try to start GPSD location on the Jolla device

And also don't print the "location enabled" message,
as this is actually handled elsewhere (in the GUI module).
Also on desktop, don't start GPSD location if Qt5 GUI is used

The Qt5 GUI currently acts as a positioning provider and connects
to GPSD internally (in Qt). So connecting to it separately in Python
is not needed.
Startup code cleanup
Fix missing buttons on main map in landscape