fix(shared): Remove matchLabel since labels on postgres pods are limited

The operator only transfers a predefined set of labels over to the
database Pods, therefore using matchLabels here, will result in a
non-functional network policy.

shared/networkpolicies/allow-from-database.yaml

@@ -45,7 +45,6 @@ spec:
             operator: In
             values:
               - spilo
-        matchLabels: {}
     ports:
     - port: 8008
       protocol: TCP