fix: remove target=_blank from Help menu redirect

Atum shows an external-link icon for _blank links, disrupting the
sidebar flow. The help link now opens in the same window.

Claude-Session: https://claude.ai/code/session_01Jo2JpjCwfHAh2HHRSjczKq

source/packages/plg_system_mokosuiteclient/Extension/MokoSuiteClient.php

@@ -383,12 +383,9 @@ class MokoSuiteClient extends CMSPlugin implements BootableExtensionInterface
 				var url = " . json_encode($supportUrl) . ";
 				document.querySelectorAll('a[href*=\"help.joomla.org\"], a[href*=\"docs.joomla.org\"]').forEach(function(link) {
 					link.href = url;
-					link.target = '_blank';
 				});
 				document.querySelectorAll('a[href*=\"dashboard=help\"]').forEach(function(link) {
 					link.href = url;
-					link.target = '_blank';
-					link.rel = 'noopener noreferrer';
 				});
 			});
 		");