update Slovenian thesaurus

Change-Id: I80c89e153fa4ada0c3793bee6e0d089f73041734
Reviewed-on: https://gerrit.libreoffice.org/7507
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>