Update PointLightShadowRenderer: remove unused imports

Author: capdevon

jme3-core/src/main/java/com/jme3/shadow/PointLightShadowRenderer.java

@@ -43,7 +43,6 @@
 import com.jme3.renderer.queue.GeometryList;
 import com.jme3.renderer.queue.RenderQueue;
 import com.jme3.scene.Geometry;
-import com.jme3.scene.Node;
 import com.jme3.scene.Spatial;
 import com.jme3.util.TempVars;
 import com.jme3.util.clone.Cloner;