Since Odoo 9.0, the `return_label` in url was not working anymore. What it did before 9.0 is add an item in the breadcrumb which once clicked would redirect to the frontend. This was handled in the `do_load_state` of the action manager in JS. We don't need to reimplement that behavior as now we have the 'Go to website' stat button. Thus we remove the code. Closes #36325 Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>