Merge pull request #162 from Unity-Technologies/fix_yamato_issue

bug fix

com.unity.uiwidgets/Runtime/widgets/routes.cs

                     }
                 }
 
-                var subscribers =_listeners.getOrDefault((R) route).ToList();
+                var subscribers =_listeners.getOrDefault((R) route);
                
                 if (subscribers != null) {
                     foreach (RouteAware routeAware in subscribers) {