Fix deprecated Twig code, if condition inside the for loop

Problem/Motivation

Preparing the my site for Drupal 10, upgrade status reported deprecation in Twig code as regards using an if condition on for tags which is deprecated since Twig 2.10.0.

The issue was reported in the file, themes\contrib\startup_zymphonies_theme\templates\dataset\forum-list.html.twig

Proposed resolution

I am submitting this fix.