wireguard/babel: update firewall

wireguard/files/babel-ferm.conf.j2

@@ -12,6 +12,9 @@ domain (ip ip6) {
         proto udp dport (27275) ACCEPT;
       }
       {% endfor %}
+      interface( babel-wg-+ ) {
+        proto udp dport (6696 27275) ACCEPT;
+      }
     }
   }
 }