update mobile demo to support https

bbb-api-demo/src/main/webapp/mobile.jsp

@@ -99,6 +99,15 @@ You must have the BigBlueButton mobile client installed on your device for this
   window.location.href="<%=joinURL%>";
 </script>
 
+<%
+	} else if (joinURL.startsWith("https://") {
+		joinURL = joinURL.replace("https", "bigbluebutton");
+%>
+
+<script language="javascript" type="text/javascript">
+  window.location.href="<%=joinURL%>";
+</script>
+
 <%
 	} else {
 %>