Set max zoom to wrong value for BING to avoid excessive memory consumption -...

Set max zoom to wrong value for BING to avoid excessive memory consumption - this is a workaround, not a fix

libs/opmapcontrol/src/internals/core.cpp

@@ -360,7 +360,7 @@ namespace internals {
                     {
                         SetProjection(new MercatorProjection());
                     }
-                    maxzoom=19;
+                    maxzoom=21;
                 }
                 break;