If we have first numeric bullet and then insert any symbol bullet on same level
then suffix of numeric bullet continues with symbol
bullet as well.
Solution : Reset suffix to none if it is symbol bullet.

Change-Id: I06dddec55c6f3d8cc1545d30f7228ca08cb81396
Reviewed-on: https://gerrit.libreoffice.org/14890Tested-by: Jenkins <ci@libreoffice.org>
Tested-by: David Tardon <dtardon@redhat.com>
Reviewed-by: David Tardon <dtardon@redhat.com>