mainWindow: Only enable map type shortcuts when useful

Only enable the shortcuts to switch b/w street and aerial
map types when aerial tiles are available.
1 job for wip/mlundblad/disable-maptype-shortcuts in 8 minutes and 30 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #1329234
flatpak
flatpak

00:08:30