Remove maxLength from new section title in NWE

MediaWiki doesn't have such a limitation. This might have been copied
from the edit summary code, which used to be limited to 255 bytes.

Change-Id: I4afe9b1cde0663c47c0c2502b6e32116b912208b

modules/ve-mw/init/targets/ve.init.mw.DesktopArticleTarget.js

@@ -507,7 +507,6 @@ ve.init.mw.DesktopArticleTarget.prototype.setupNewSection = function ( surface )
 			this.sectionTitle = new OO.ui.TextInputWidget( {
 				$element: $( '<h2>' ),
 				classes: [ 've-ui-init-desktopArticleTarget-sectionTitle' ],
-				maxLength: 255,
 				placeholder: ve.msg( 'visualeditor-section-title-placeholder' ),
 				spellcheck: true
 			} );