Update call to api_key component across pages

Includes the following pages:
- letter contact (in service settings)
- sms-senders page (in service settings)
- email reply-to (in service settings)
- API key page

Note: the call on the letter contact page uses
the first line of the contact address as the
unique identifier for each button.

app/__init__.py

@@ -807,6 +807,7 @@ def add_template_filters(application):
         format_notification_status_as_url,
         format_number_in_pounds_as_currency,
         formatters.formatted_list,
+        formatters.normalise_lines,
         nl2br,
         format_phone_number_human_readable,
         format_thousands,