Remove visual noise from oovbaapi

Change-Id: I9e378028bf876fdb01c139d7d747558cac1de28c
Reviewed-on: https://gerrit.libreoffice.org/8287
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>