Test: re-enable VPN_PORT_FORWARDING to check startup check behavior

With VPN_PORT_FORWARDING=off, gluetun startup check fails with TLS EOF
for generic IP-check services. Previous session showed startup check
PASSED with VPN_PORT_FORWARDING=on (only port-forwarding API failed).
Testing to confirm VPN routing works when startup check uses ProtonVPN
API instead of generic HTTPS services.

servers/legion/k8s/media/fornax-workers.yaml

@@ -103,7 +103,7 @@ spec:
             - name: SERVER_NAMES
               value: "US-TX#179"
             - name: VPN_PORT_FORWARDING
-              value: "off"
+              value: "on"
             - name: DOT
               value: "off"
             - name: DNS_UPSTREAM_RESOLVER_TYPE
@@ -353,7 +353,7 @@ spec:
             - name: SERVER_NAMES
               value: "US-TX#220"
             - name: VPN_PORT_FORWARDING
-              value: "off"
+              value: "on"
             - name: DOT
               value: "off"
             - name: DNS_UPSTREAM_RESOLVER_TYPE