Similarly how this is possible with PDF. The toolbar button is hidden by
default in Writer, though.

Change-Id: Iaf3b61ac2160578f7eaabd194ce8932792575c29
Reviewed-on: https://gerrit.libreoffice.org/42554Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>