update Slovenian thesaurus

Change-Id: I80c89e153fa4ada0c3793bee6e0d089f73041734
Reviewed-on: https://gerrit.libreoffice.org/7508
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>