Update webgpu_shadowmap_csm.html

Clean up.

examples/webgpu_shadowmap_csm.html

@@ -281,8 +281,6 @@
 
 				helperFolder.add( params, 'updateHelper' ).name( 'update' );
 
-				helperFolder.open();
-
 				window.addEventListener( 'resize', function () {
 
 					camera.aspect = window.innerWidth / window.innerHeight;