[FIX] website: proper override of auth_signup

Add the dependency between website and auth_signup
auth_signup is in auto-install but there was no strict dependency

Before this commit, installing website transformed the field
auth_signup_uninvited from a static list to a computed list (due to related).

This fixes the following bug:
1. install auth_signup
-> create selections
2. install webstite
-> remove selections and turn it into a computed field with dynamic
selections
3. update auth_signup
-> recreate the selections when updating the module
4. reload the registry (automatic at the end of update)
-> try to remove the selections -> error as not in install/uninstall
mode

Instead, keep the list static and turn it into a computed field with
inverse

closes odoo/odoo#35861

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

addons/website/__manifest__.py

@@ -15,6 +15,7 @@
         'http_routing',
         'portal',
         'social_media',
+        'auth_signup',
     ],
     'installable': True,
     'data': [

addons/website/models/res_config_settings.py

@@ -40,7 +40,8 @@ class ResConfigSettings(models.TransientModel):
     cdn_filters = fields.Text(related='website_id.cdn_filters', readonly=False)
     module_website_version = fields.Boolean("A/B Testing")
     module_website_links = fields.Boolean("Link Trackers")
-    auth_signup_uninvited = fields.Selection("Customer Account", related='website_id.auth_signup_uninvited', readonly=False)
+    auth_signup_uninvited = fields.Selection(compute="_compute_auth_signup",
+        inverse="_set_auth_signup")
 
     social_twitter = fields.Char(related='website_id.social_twitter', readonly=False)
     social_facebook = fields.Char(related='website_id.social_facebook', readonly=False)
@@ -73,6 +74,15 @@ class ResConfigSettings(models.TransientModel):
     google_maps_api_key = fields.Char(related='website_id.google_maps_api_key', readonly=False)
     group_multi_website = fields.Boolean("Multi-website", implied_group="website.group_multi_website")
 
+    @api.depends('website_id.auth_signup_uninvited')
+    def _compute_auth_signup(self):
+        for config in self:
+            config.auth_signup_uninvited = config.website_id.auth_signup_uninvited
+
+    def _set_auth_signup(self):
+        for config in self:
+            config.website_id.auth_signup_uninvited = config.auth_signup_uninvited
+
     @api.depends('website_id')
     def has_google_analytics(self):
         self.has_google_analytics = bool(self.google_analytics_key)