Respect the default format from the scene graph adaptation layer

Change-Id: I080c25ed8b8cc8b743043b5aa348927749c1f0eb
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>

tools/qmlscene/main.cpp

@@ -501,7 +501,7 @@ int main(int argc, char ** argv)
             }
 
             if (window) {
-                QSurfaceFormat surfaceFormat;
+                QSurfaceFormat surfaceFormat = window->requestedFormat();
                 if (options.multisample)
                     surfaceFormat.setSamples(16);
                 if (options.transparent) {