[4.0] [Validation] Fix backend menu items with role="menuitem" not pl…

…aced inside element with role="menu" (#21150)

* Fix menu items with role="menuitem" not placed inside element with role="menubar"

* Use role="menu" instead of role="menubar"

administrator/modules/mod_menu/tmpl/default.php

@@ -26,7 +26,7 @@
 if ($root->hasChildren())
 {
 	echo '<div class="main-nav-container" role="navigation" aria-label="Main menu">';
-	echo '<ul id="menu" class="' . $class . '">' . "\n";
+	echo '<ul id="menu" class="' . $class . '" role="menu">' . "\n";
 	echo '<li role="menuitem">';
 	echo '<a id="menu-collapse" href="#">';
 	echo '<span id="menu-collapse-icon" class="fa-fw fa fa-toggle-off" aria-hidden="true"></span>';