do not use session_id in GAS_performance_notify_all_clients, needs to be 'active'; also indentation/doxygen

git-svn-id: https://gnunet.org/svn/gnunet@33672 140774ce-b5e7-0310-ab8b-a85725594a96
notify performance monitors about destroyed addresses (for #3406)

git-svn-id: https://gnunet.org/svn/gnunet@33673 140774ce-b5e7-0310-ab8b-a85725594a96