We need to export 0 padding explicitely to DOCX file.

Change-Id: I7126cfd1dbf4ebd1fb5e09c3642e0da159488258
Reviewed-on: https://gerrit.libreoffice.org/47090Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/47103Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>