BACAPP: fix dissection of event parameters for event notifications of Event_Type Change_of_Status_Flags

Implementation for this event parameter type was missing

Bug: 9626
Change-Id: Iea0bc819858bbf5660d97cfd0c418a963ac149fb
Reviewed-on: https://code.wireshark.org/review/5228
Reviewed-by: Michael Mann <mmann78@netscape.net>
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>