Always show created time for sending state

When a notification is in `created` or `sending` the thing you care
about is how long it’s been sitting there.

app/__init__.py

@@ -282,11 +282,11 @@ def format_notification_status(status, template_type):
     }.get(template_type).get(status, status)
 
 
-def format_notification_status_as_time(status, when):
+def format_notification_status_as_time(status, created, updated):
     return {
-        'sending': ' since {}'.format(when),
+        'sending': ' since {}'.format(created),
-        'created': ' since {}'.format(when)
+        'created': ' since {}'.format(created)
-    }.get(status, when)
+    }.get(status, updated)
 
 
 def format_notification_status_as_field_status(status):

app/templates/components/table.html

@@ -113,6 +113,7 @@
     {% endif %}
     <span class="status-hint">
       {{ notification.status|format_notification_status_as_time(
+        notification.created_at|format_datetime_short,
         (notification.updated_at or notification.created_at)|format_datetime_short
       ) }}
     </span>