RemovalClient sendRemoved should check remaining instead of fingerId

Test: for each of the following, make sure code goes into
if (client != null && client.onRemoved(fingerId, groupId, remaining)) {
    removeClient(client);
}

1) remove single fingerprint
2) remove all fingerprint by removing password

Change-Id: I6f1ebd42c05fd57225dd4808766791ff1922b09e
Fixes: 37992170