Fixed the duplicate definition errors in normal.vert

...I left them commented out for reference and because
maybe this needs some rethinking.

jme3-effects/src/main/resources/Common/MatDefs/SSAO/normal.vert

@@ -1,7 +1,8 @@
 #import "Common/ShaderLib/Instancing.glsllib"
 #import "Common/ShaderLib/Skinning.glsllib"
-uniform mat4 g_WorldViewProjectionMatrix;
-uniform mat3 g_NormalMatrix;
+// These are included in the above now
+//uniform mat4 g_WorldViewProjectionMatrix;
+//uniform mat3 g_NormalMatrix;
 
 attribute vec3 inPosition;
 attribute vec3 inNormal;