Fix remembering of radar overlay state on geomap

[vincent-legoll]

The radar overlay remembering is done on the wrong level: the GEO_SetOverlay_f() console command instead of the underlying GEO_SetOverlay(). Move this handling therein.

To reproduce: in a campaign game, on geoscape, toggle the radar overlay view on, then click on the globe, or select a base and exit back to geoscape to find that the radar overlay has been disabled back instead of being properly remembered.

[vincent-legoll]

This is not the right fix, and not the proper way to contribute