* [misc] Delete duplicate mainContent id.

module/custom/ui/required.html.php

@@ -53,7 +53,6 @@ if(common::hasPriv('custom', 'resetRequired'))
 if(!in_array($module, array('productplan', 'release', 'testsuite', 'testreport', 'caselib', 'doc')) && (!in_array($module, array('project', 'execution')) || (in_array($module, array('project', 'execution')) && $config->vision == 'rnd'))) include 'sidebar.html.php';
 div
 (
-    setID('mainContent'),
     setClass('row has-sidebar-left'),
     isset($sidebarMenu) ? $sidebarMenu : null,
     formPanel