If a list bulletChar is a soft-hyphen, it will disappear in PDF export.
Therefore, replace it by a hard-hyphen.

Change-Id: If0b535e7d2e23454136f25a2b7acf4b294b8dd27
Reviewed-on: https://gerrit.libreoffice.org/33707Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>