erp5_web_renderjs_ui_test: we don't need pass is_updating anymore

Because, for now, it is always false, then submitDialogWithCustomDialogMethod handle it

bt5/erp5_web_renderjs_ui_test/SkinTemplateItem/portal_skins/erp5_web_renderjs_ui_test/gadget_submit_button.js.js

@@ -28,7 +28,7 @@
     .onEvent('click', function click(evt) {
       if (evt.target.type === "button") {
         evt.preventDefault();
-        return this.submitDialogWithCustomDialogMethod(false, this.state.python_script_id);
+        return this.submitDialogWithCustomDialogMethod(this.state.python_script_id);
       }
     }, false, false);