membershipworks: Add header for event registrations when printing

membershipworks/templates/membershipworks/event_registrations.dj.html

@@ -23,6 +23,7 @@
       </div>
       <div class="col-auto">{% include "cmsmanage/components/download_table.dj.html" %}</div>
     </div>
+    <h2 class="d-none d-print-block">Registrations for {{ event.details.ttl|nh3 }}</h2>
     {% render_table table %}
     <p class="text-center">Data last updated {{ event.details_timestamp }}</p>
   </div>