FIX form_panel module's members

src/core/js/form_panel.js

@@ -82,12 +82,9 @@ var form_panel = new function () {
             }
         }
     };
-    const init = function () {
-    }
-    return {
-        init: init,
-    };
 
+    this.init = function () {
+    }
 }
 
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