[FIX] website: Impossible to link an analytic account

Steps to reproduce the bug:

- Go to Website > Dashboard > Analytics and click on "Link my analytics account"
- Enter some data and save

Bug:

A traceback was raised: TypeError: website_set_ga_data() missing 1 required
positional argument: 'website_id'

opw:1905874

closes odoo/odoo#28636

addons/website/controllers/backend.py

@@ -61,6 +61,6 @@ class WebsiteBackend(http.Controller):
         request.env['res.config.settings'].create({
             'google_management_client_id': ga_client_id,
             'google_analytics_key': ga_analytics_key,
-            'website_id': current_website,
+            'website_id': current_website.id,
         }).execute()
         return True

addons/website/static/src/js/backend/dashboard.js

@@ -44,6 +44,9 @@ var Dashboard = AbstractAction.extend(ControlPanelMixin, {
         var self = this;
         return $.when(ajax.loadLibs(this), this._super()).then(function() {
             return self.fetch_data();
+        }).then(function(){
+            var website = _.findWhere(self.websites, {selected: true});
+            self.website_id = website ? website.id : false;
         });
     },