Fix eslint wrap-iife in es5 files

[MAILPOET-1145]

.eslintrc.es5.json

@@ -30,7 +30,6 @@
     "no-console": 0,
     "no-empty": 0,
     "no-useless-escape": 0,
-    "wrap-iife": 0,
     "brace-style": 0,
     "space-infix-ops": 0
   }

assets/js/src/form_editor/form_editor.js

@@ -134,7 +134,7 @@ Object.extend(document, (function () {
       return document;
     }
   };
-})());
+}()));
 
 Observable = (function () {
   function getEventName(nameA, namespace) {
@@ -188,7 +188,7 @@ Observable = (function () {
       delete this.handlers[selector];
     }
   };
-})();
+}());
 
 // override droppables
 Object.extend(window.Droppables, {