Fix bug in findOrderedTripsOfTrain

src/main/java/fr/univnantes/trainreservation/impl/TicketReservationSystemImpl.java

@@ -162,7 +162,7 @@ public class TicketReservationSystemImpl implements TicketReservationSystem {
 
     @Override
     public List<Trip> findOrderedTripsOfTrain(Train train) {
-        return trips.stream().filter((someTrain -> someTrain == train)).sorted((t1, t2) -> t1.findRealArrivalTime().isBefore(t2.findRealDepartureTime()) ? -1 : 1).collect(Collectors.toList());
+        return trips.stream().filter((someTrip -> someTrip.getTrain() == train)).sorted((t1, t2) -> t1.findRealArrivalTime().isBefore(t2.findRealDepartureTime()) ? -1 : 1).collect(Collectors.toList());
     }
 
     @Override