[FIX] mail_plugin: fix an error during the authentication

Bug
===
Since 478068c829 we wanted to use the
Odoo redirection function everywhere.

But this function work only if we redirect the user to the same site.

The mail plugin need to redirect outside of Odoo and so we can not use
this function.

closes odoo/odoo#73698

Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

addons/mail_plugin/controllers/authenticate.py

@@ -50,7 +50,7 @@ class Authenticate(http.Controller):
         else:
             params.update({'success': 0, 'state': kw.get('state', '')})
         updated_redirect = parsed_redirect.replace(query=werkzeug.urls.url_encode(params))
-        return request.redirect(updated_redirect.to_url())
+        return request.redirect(updated_redirect.to_url(), local=False)
 
     # In this case, an exception will be thrown in case of preflight request if only POST is allowed.
     @http.route(['/mail_client_extension/auth/access_token', '/mail_plugin/auth/access_token'], type='json', auth="none", cors="*",