+ replace list by vector for maFontSubstList

Change-Id: I4d5668611212358c759fa5cf26f5341311551298
Reviewed-on: https://gerrit.libreoffice.org/43855Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>