[FIX] website: make test works with more website than the data ones

This test was raising an assert error if the DB has other websites than  the
data/demo ones.

As we have a new module in Odoo 13.0 (https://github.com/odoo/design-themes/pull/178

)
which is creating 25 websites, and since the design-themes runbot is now
running tests, we were having a red design-themes runbot.

closes odoo/odoo#39002

X-original-commit: 5c7b4463
Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

addons/website/tests/test_get_current_website.py

@@ -50,7 +50,7 @@ class TestGetCurrentWebsite(TransactionCase):
         self.assertEqual(Website._get_current_website_id('', country3.id), website2.id)
 
         # CASE: no domain, wrong country: get first
-        self.assertEqual(Website._get_current_website_id('', country4.id), website1.id)
+        self.assertEqual(Website._get_current_website_id('', country4.id), Website.search([]).sorted('country_group_ids')[0].id)
 
         # CASE: no domain, multiple country: get first
         self.assertEqual(Website._get_current_website_id('', country5.id), website1.id)