[IMP] auth_signup: redirect activated user to login on signup link

Purpose
=======
When a user receives an email to activate their account, allow them to
click on the "Activate Account" button after the account has already
been activated instead of showing a "Invalid signup token" error.

Specifications
=============
Add a parameter p_id to the sign up url to check if the partner has
already activated their account (if their user_ids state is not new) and
redirect them to login otherwise.

Task-2680414

closes odoo/odoo#79936

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/web/controllers/home.py

@@ -21,7 +21,7 @@ _logger = logging.getLogger(__name__)
 # Shared parameters for all login/signup flows
 SIGN_UP_REQUEST_PARAMS = {'db', 'login', 'debug', 'token', 'message', 'error', 'scope', 'mode',
                           'redirect', 'redirect_hostname', 'email', 'name', 'partner_id',
-                          'password', 'confirm_password', 'city', 'country_id', 'lang'}
+                          'password', 'confirm_password', 'city', 'country_id', 'lang', 'signup_email'}
 LOGIN_SUCCESSFUL_PARAMS = set()