Wireguard: Fix margau's stupidity

wireguard/files/dn42-interfaces-wireguard.j2

@@ -18,7 +18,7 @@ iface {{ iface_prefix }}_{{ peer.name }} inet static
 iface {{ iface_prefix }}_{{ peer.name }} inet6 static
     address {{ peer.addr.local.ip6.address }}/127
 {%- endif %}
-{%- elif %}
+{%- else %}
 # V6 only WG-Interface
 {% if 'ip6' in peer.addr.local %}
 iface {{ iface_prefix }}_{{ peer.name }} inet6 static