VML shapes from docx should be invisible if "visibility:hidden" is set.
Change-Id: I8299a5c3a7fca8deae2ec37523c3f2e240376893
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/167989
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>
