Allow microphone, camera in iframe mobile integration

templates/mobile_view_page.mustache

@@ -3,6 +3,7 @@
     <iframe
             src="<% wwwroot %>/mod/hvp/embed.php?id=<% cmid %>&user_id=<% user_id %>&secret=<% secret %>"
             frameborder="0"
+            allow="microphone; camera"
             allowfullscreen="allowfullscreen">
     </iframe>
 </div>