User data not reloading after auth state changes

[Peter Friese]

When a user signs in (or out), the task data in the main task list doesn't refresh.

[Peter Friese]

This is a regression introduced in a local branch. Instead of re-creating the snapshot listener, we continue using the old one (with the previous auth state).

The previously used code did a better job:

if listenerRegistration != nil {
  listenerRegistration?.remove()
}
listenerRegistration = db.collection(tasksPath)
// ...