Enable some recommended Coturn options in an effort to lower DDoS amplification factor

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2592

roles/custom/matrix-coturn/templates/turnserver.conf.j2

@@ -35,6 +35,18 @@ prod
 no-tcp-relay
 {% endif %}
 
+{% if matrix_coturn_no_rfc5780_enabled %}
+no-rfc5780
+{% endif %}
+
+{% if matrix_coturn_no_stun_backward_compatibility_enabled %}
+no-stun-backward-compatibility
+{% endif %}
+
+{% if matrix_coturn_response_origin_only_with_rfc5780_enabled %}
+response-origin-only-with-rfc5780
+{% endif %}
+
 {% if matrix_coturn_user_quota != None %}
 user-quota={{ matrix_coturn_user_quota }}
 {% endif %}