In 6b3cc69f this was done for draw images,
this patch also implements this for Writer images.

Change-Id: I54f8142c3d22e1a356aedbcf2daf9d7a9b049423
Reviewed-on: https://gerrit.libreoffice.org/45673Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
(cherry picked from commit 2d3023c9)
Reviewed-on: https://gerrit.libreoffice.org/45800