BT obex: Missing break in switch (CID 1132031)

Change-Id: I6b8fc8db006bc3b8f8f4bac019cb7e240931d3b5
Reviewed-on: https://code.wireshark.org/review/5619
Reviewed-by: Michal Labedzki <michal.labedzki@tieto.com>
Reviewed-by: Michael Mann <mmann78@netscape.net>