Fix getMapAsync() for LiteGoogleMap

Spotify was crashing because of some lateinit property in Spotify snapshot ready
callback was not initialized.

Looking at the condition we can observe that GmsCore was calling the snapshot ready
callback when the snapshot was null, which does not make sense.

Inverting the logic and calling the callback when the snapshot was not null anymore
fixed the issue and Spotify was able to display the snapshot.

play-services-maps/core/mapbox/src/main/kotlin/org/microg/gms/maps/mapbox/LiteGoogleMap.kt

@@ -365,7 +365,7 @@ class LiteGoogleMapImpl(context: Context, var options: GoogleMapOptions) : Abstr
     }
 
     fun getMapAsync(callback: IOnMapReadyCallback) {
-        if (lastSnapshot == null) {
+        if (lastSnapshot != null) {
             Log.d(TAG, "Invoking callback instantly, as a snapshot is ready")
             callback.onMapReady(this)
         } else {