Remove unnecessary comma in webgl_materials_cars

examples/webgl_materials_cars.html

@@ -312,7 +312,7 @@
 						[ "Bronze", 	mlib[ "Bronze" ] ],
 						[ "Chrome", 	mlib[ "Chrome" ] ]
 
-					],
+					]
 
 				};
 
@@ -353,7 +353,7 @@
 						[ "Bronze", 	mlib[ "Bronze" ] ],
 						[ "Chrome", 	mlib[ "Chrome" ] ]
 
-					],
+					]
 
 				};
 
@@ -413,7 +413,7 @@
 						[ "Bronze", 	mlib[ "Bronze" ] ],
 						[ "Chrome", 	mlib[ "Chrome" ] ]
 
-					],
+					]
 
 				};