marionette: code style fix for #1271

  "When using anonymous functions, leave a space between the function name and
  opening parenthesis."

https://github.com/tastejs/todomvc/blob/master/codestyle.md#anonymous-functions

examples/backbone_marionette/index.html

@@ -71,7 +71,7 @@
 		<script src="js/TodoMVC.TodoList.js"></script>
 		<script>
 			$(function () {
-				TodoMVC.on('start', function() {
+				TodoMVC.on('start', function () {
 					Backbone.history.start();
 				});
 				// start the TodoMVC app (defined in js/TodoMVC.js)