MPO: fix unit test

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

@@ -114,7 +114,7 @@ MaterialDef Phong Lighting {
         //For instancing
         Boolean UseInstancing
 
-        Boolean BackfaceShadows: false
+        Boolean BackfaceShadows : false
     }
 
     Technique {

jme3-core/src/test/java/com/jme3/material/MaterialMatParamOverrideTest.java

@@ -63,7 +63,7 @@ import java.util.Map;
 public class MaterialMatParamOverrideTest {
 
     private static final HashSet<String> IGNORED_UNIFORMS = new HashSet<String>(
-            Arrays.asList(new String[]{"m_ParallaxHeight", "m_Shininess"}));
+            Arrays.asList(new String[]{"m_ParallaxHeight", "m_Shininess", "m_BackfaceShadows"}));
 
     @Test
     public void testBoolMpoOnly() {