Fix Passau tile coords: 1099->1100, 706->707

Computed precisely: zoom 11, lat 48.5667, lon 13.4319.
x_norm = (lon+180)/360 = 0.5373, x_tile = 1100.41 -> floor 1100
y_norm = 0.3452, y_tile = 707.07 -> floor 707

Previously had 1099/706 which placed the centre one tile west and
one tile south of Passau. User observed the tile content was
'vertauscht' — it was correct ESRI imagery of a different geographic
location (near Schärding), not Passau itself.

vendor/clouds3d.js

@@ -295,8 +295,8 @@ var GROUND_CORRIDOR_PERP = 5;     // tiles perpendicular to travel
 var GROUND_BUFFER_LONG = 11;       // refetch when this close to forward edge
 var GROUND_BUFFER_PERP = 1;       // refetch when this close to side edge
 // Passau tile at zoom 11
-var GROUND_BASE_X = 1099;
-var GROUND_BASE_Y = 706;
+var GROUND_BASE_X = 1100;
+var GROUND_BASE_Y = 707;
 
 // Module-level state, shared across renderer instances
 var groundCanvas = null;