Presentation string for recently-added border types

LibreOffice will show a textual description of a style in some contexts
eg in the Organizer tab of the dialog for modifying a style.

This change updates the description of border line types to support
recently-added types: FINE_DASHED, DOUBLE_THIN, DASH_DOT, DASH_DOT_DOT

Also this fixes an out-of-bounds array access in
SvxBorderLine::GetValueString

Change-Id: Ia354a05ab1455eb8bcc079c6e51419a0cc6429d6
Reviewed-on: https://gerrit.libreoffice.org/8781
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>