[FIX] web_editor: DOMElement used as jQuery element

The function receives a jQuery element most of the time but it
may receive a DOMElement in some cases.

addons/web_editor/static/src/js/rte.js

@@ -271,10 +271,11 @@ var RTE = Widget.extend({
      * @param {DOM} target where the dom is changed is editable zone
      */
     historyRecordUndo: function ($target, event, internal_history) {
+        $target = $($target);
         var rng = range.create();
         var $editable = $(rng && rng.sc).closest(".o_editable");
         if (!rng || !$editable.length) {
-            $editable = $($target).closest(".o_editable");
+            $editable = $target.closest(".o_editable");
             rng = range.create($target.closest("*")[0],0);
         } else {
             rng = $editable.data('range') || rng;