remove unused argument width

examples/webgl_materials_cubemap_mipmaps.html

@@ -36,7 +36,7 @@
 				var mipmaps = [];
 				var maxLevel = 8;
 
-				async function loadCubeTexture( urls, width ) {
+				async function loadCubeTexture( urls ) {
 
 					return new Promise( function ( resolve, reject) {