Add auth attribute to toolkit demo

toolkit-showcase/assets/dbp-toolkit-showcase.html.ejs

@@ -61,6 +61,7 @@
               nextcloud-file-url="<%= nextcloudFileURL %>">
     <<%= name %>
         src="<%= getUrl(name + '.topic.metadata.json') %>"
+        auth
         base-path="<%= getUrl('') %>"
         keycloak-config='{"url": "<%= keyCloakBaseURL %>", "realm": "tugraz", "clientId": "<%= keyCloakClientId %>", "silentCheckSsoRedirectUri": "<%= getUrl('silent-check-sso.html') %>"}'
         matomo-url="<%= matomoUrl %>" matomo-site-id="<%= matomoSiteId %>"