Remove fixed pipeline technique from lighting shader

jme3-core/src/main/resources/Common/MatDefs/Light/Lighting.j3md

@@ -357,10 +357,6 @@ MaterialDef Phong Lighting {
         }
     }
 
-    Technique {
-        LightMode FixedPipeline
-    }
-
     Technique Glow {
 
         VertexShader GLSL100:   Common/MatDefs/Misc/Unshaded.vert