Remove visual noise from drawinglayer

Change-Id: Ida745b9d994d09081ad3d18cdf2494a97438dc56
Reviewed-on: https://gerrit.libreoffice.org/8253
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>