Show full emails on check notifications page

Because we’re going to use a sticky footer on this page we don’t need
to show the email in its collapsed form. Showing the email is only
needed to:
- fit more things on a page
- make sure a button comes up above the fold (which the sticky footer
  will solve)

app/main/views/send.py

@@ -853,6 +853,7 @@ def _check_notification(service_id, template_id, exception=None):
         db_template,
         current_service,
         show_recipient=True,
+        expand_emails=True,
         email_reply_to=email_reply_to,
         sms_sender=sms_sender,
         letter_preview_url=url_for(