Fix cullMode API usage in SSAO manual test

Change-Id: Id5ab54370df40a5a285b3ffb6742ef1ec186f144
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

tests/manual/ssao/ssao.qml

@@ -274,7 +274,7 @@ Item {
             scale: Qt.vector3d(scaleSlider.value, scaleSlider.value, scaleSlider.value)
             materials: [ DefaultMaterial {
                     lighting: DefaultMaterial.FragmentLighting
-                    cullingMode: Material.DisableCulling
+                    cullMode: Material.NoCulling
                 } ]
             eulerRotation: Qt.vector3d(rotationXSlider.value, rotationYSlider.value, rotationZSlider.value)
         }