remove unused code in ScRawToken

Change-Id: I8f644ac7f7bbdd2c9cb6f5a41709e41efa737885
Reviewed-on: https://gerrit.libreoffice.org/12423
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>