MeshNormalMaterial: Removed superfluous argument.

src/materials/MeshNormalMaterial.js

@@ -29,7 +29,7 @@ import { Vector2 } from '../math/Vector2';
 
 function MeshNormalMaterial( parameters ) {
 
-	Material.call( this, parameters );
+	Material.call( this );
 
 	this.type = 'MeshNormalMaterial';