Remove visual noise from reportbuilder

Change-Id: I4063ea1ea95ddd1a3c220ca0da89cdcd78f62410
Reviewed-on: https://gerrit.libreoffice.org/8294
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>