fix inverted axis in gltf loader

Author: riccardobl

jme3-plugins/src/gltf/java/com/jme3/scene/plugins/gltf/LightsPunctualExtensionLoader.java

@@ -209,6 +209,7 @@ private void addLight(Node parent, Node node, int lightIndex) {
             Light light = lightDefinitions.get(lightIndex);
             parent.addLight(light);
             LightControl control = new LightControl(light);
+            control.setInvertAxisDirection(true);
             node.addControl(control);
         } else {
             throw new AssetLoadException("KHR_lights_punctual extension accessed undefined light at index " + lightIndex);