[FIX] website: wrong fw-port of commit 971f324c419

Since commit [1], we should use domain instead of _get_http_domain()
that was removed.

[1]: https://github.com/odoo/odoo/commit/7d8a8ddea0b363732f2177ad589a3e0e10e2fb6c

closes odoo/odoo#85692

X-original-commit: 82341e9bd0cad8320fd1b95f3369cf2074978cb0
Signed-off-by: Romain Derie (rde) <rde@odoo.com>
Signed-off-by: Alex Thuyls (alt) <alt@odoo.com>

addons/website/models/mixins.py

@@ -4,6 +4,8 @@
 import logging
 import re
 
+from werkzeug.urls import url_join
+
 from odoo import api, fields, models, _
 from odoo.addons.website.tools import text_from_html
 from odoo.http import request
@@ -280,6 +282,13 @@ class WebsitePublishedMultiMixin(WebsitePublishedMixin):
         else:  # should be in the backend, return things that are published anywhere
             return is_published
 
+    def open_website_url(self):
+        return {
+            'type': 'ir.actions.act_url',
+            'url': url_join(self.website_id.domain, self.website_url) if self.website_id else self.website_url,
+            'target': 'self',
+        }
+
 
 class WebsiteSearchableMixin(models.AbstractModel):
     """Mixin to be inherited by all models that need to searchable through website"""