A rider may see a cancelled tasks in its TaskList

[Atala]

Steps to reproduce

1. Open web dispatch and smartphone app
2. Assign a delivery or task to a rider
3. Right click in the task and cancel it
4. The task is not cancelled or removed in the rider app. The rider still thinks he has to do the task.

The cause is that the task_list:updated event is not sent because the task_list itself is not changed BUT the task is updated (CANCELLED) so we should react to this event.