Replace message_status component with banner

Message status was almost identical to banner, visually and semantically.
This consolidates the two into one component.

This means adding an extra parameter which controls whether or not the banner
has a tick (with and without a tick are the only two variations currently).

app/templates/components/sms-message.html

@@ -10,11 +10,3 @@
     </p>
   {% endif %}
 {% endmacro %}
-
-{% macro message_status(status, time) %}
-  <div class="sms-message-history">
-    <p class="sms-message-history-heading">
-      {{ status }} <span class="sms-message-history-heading-time">{{ time }}</span>
-    </p>
-  </div>
-{% endmacro %}