SinglePass Lighting: fix light color not being used for specular highlight

jme3-core/src/main/resources/Common/MatDefs/Light/SPLighting.frag

@@ -222,7 +222,7 @@ void main(){
             #endif
 
             gl_FragColor.rgb += DiffuseSum.rgb   * lightColor.rgb * diffuseColor.rgb  * vec3(light.x) +
-                                SpecularSum2.rgb * specularColor.rgb * vec3(light.y);
+                                SpecularSum2.rgb * lightColor.rgb * specularColor.rgb * vec3(light.y);
         }
            
      #endif