update notifications page to take into account first class!

tests/conftest.py

@@ -2645,6 +2645,7 @@ def mock_get_notification(
     template_name='sample template',
     is_precompiled_letter=False,
     key_type=None,
+    postage=None
 ):
     def _get_notification(
         service_id,
@@ -2655,6 +2656,7 @@ def mock_get_notification(
             rows=1,
             status=notification_status,
             template_type=template_type,
+            postage=postage
         )['notifications'][0]
 
         noti['id'] = notification_id