Re-enable SKOS package install in UNESCO thesaurus install script

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: namedgraph

demo/unesco-thesaurus/install.sh

@@ -47,7 +47,7 @@ fi
 
 printf "\n### Installing SKOS package\n\n"
 
-#install-package.sh -b "$base" -f "$cert_pem_file" -p "$cert_password" --proxy "$proxy" --package "https://packages.linkeddatahub.com/skos/#this"
+install-package.sh -b "$base" -f "$cert_pem_file" -p "$cert_password" --proxy "$proxy" --package "https://packages.linkeddatahub.com/skos/#this"
 
 printf "\n### Importing SKOS vocabulary\n\n"