Remove redundant closure for all modules with packageFiles

Modules loaded with packageFiles are always executed in module scope
(with a closure), even in debug mode.

The behaviour of non-packageFiles debug mode is the only reason files
have closures.

https://www.mediawiki.org/wiki/Manual:Coding_conventions/JavaScript#Closure

Change-Id: I7ea2057029a63148a96333af7ff09a7885d2daa8

modules/ext.categoryTree/ext.categoryTree.js

@@ -22,7 +22,6 @@
  * @author Daniel Kinzler, brightbyte.de
  */
 
-( function () {
 const config = require( './data.json' );
 
 /**
@@ -194,5 +193,3 @@
 	// eslint-disable-next-line no-jquery/no-global-selector
 	attachHandler( $( '#p-categorytree-portlet' ) );
 } );
-
-}() );