Move static pSpecsSubLines into properties container

Change-Id: I0ff8ab2c36960a5b9b8108269fca88b325d001f6
Reviewed-on: https://gerrit.libreoffice.org/12487
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>