fix bug in helper attribute

trainbenchmark-tool-jastadd-specialized-base/src/main/jastadd/TreeNavigation.jrag

@@ -135,7 +135,7 @@ aspect TreeNavigation {
     // update the values
     for (Route route : getRouteList()) {
       for (Sensor sensor : route.getRequiredSensorList()) {
-        routeMap.get(sensor).add(route);
+        routeMap.get(sensor.getId()).add(route);
       }
     }