fixing participant page in archiving sample app

Author: aoberoi

sample/Archiving/templates/participant.html

@@ -49,8 +49,8 @@ <h3 class="panel-title">Instructions</h3>
   </div>
 
     <script>
-        var sessionId = "{{ sessionId }}";
-        var apiKey = "{{ apiKey }}";
+        var sessionId = "{{ session_id }}";
+        var apiKey = "{{ api_key }}";
         var token = "{{ token }}";
     </script>
     <script src="{{ url_for('static', filename='js/participant.js') }}"></script>