Issue #3066954 by andrewmacpherson, Wim Leers, bnjmnm, OBKev: Admin toolbar...

Issue #3066954 by andrewmacpherson, Wim Leers, bnjmnm, OBKev: Admin toolbar not usable with latest versions of JAWS due to mis-use of aria-owns

(cherry picked from commit 81c058aa)

core/modules/toolbar/src/Element/ToolbarItem.php

@@ -56,7 +56,6 @@ public static function preRenderToolbarItem($element) {
       // Provide attributes necessary for trays.
       $attributes += [
         'data-toolbar-tray' => $id . '-tray',
-        'aria-owns' => $id . '-tray',
         'role' => 'button',
         'aria-pressed' => 'false',
       ];