fix(postgres): Fix wrong network policy defintion

This patch puts the port definitions into the right place and uses the
key `port` instead of `containerPort` as expected by NetworkPolicy
objects.

infrastructure/postgres/user-namespace-network-policy.yaml

@@ -20,15 +20,15 @@ spec:
             - namespaceSelector:
                 matchLabels:
                   name: zalando-postgres
+            ports:
+            - containerPort: 8008
+              protocol: TCP
+            - containerPort: 5432
+              protocol: TCP
+            - containerPort: 8080
+              protocol: TCP
           podSelector:
             matchLabels:
               application: spilo
           policyTypes:
           - Ingress
-          ports:
-          - containerPort: 8008
-            protocol: TCP
-          - containerPort: 5432
-            protocol: TCP
-          - containerPort: 8080
-            protocol: TCP