Only show warning on jury problemset page before contest start.

Author: meisterT

webapp/templates/jury/problemset.html.twig

@@ -11,6 +11,6 @@
         problem_statement_path: 'jury_problem_statement',
         problem_attachment_path: 'jury_attachment_fetch',
         problem_sample_zip_path: 'jury_problem_sample_zip',
-        show_jury_warning: true
+        show_jury_warning: not current_contest.state.started
     } %}
 {% endblock %}