Switch to satellite image map provider

The current google map provider doesn't show coast lines properly and
a lot of islands aren't shown at all.
OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_HYBRID is much better IMHO.

Signed-off-by: Henrik Brautaset Aronsen <subsurface@henrik.synth.no>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>