correct a copy/paste mistake

Author: bobeagan

examples/auth-flow/app.js

@@ -34,7 +34,7 @@ var App = React.createClass({
           <li><Link to="about">About</Link></li>
           <li><Link to="dashboard">Dashboard</Link> (authenticated)</li>
         </ul>
-        {this.props.activeRouteHandler()()}
+        {this.props.activeRouteHandler()}
       </div>
     );
   }