Set proper group ownership of /etc/pgbackrest
Set proper group ownership of /etc/pgbackrest

The previous commit flipped this in the wrong direction per the
OCP 3.11 guide. This will properly support Kube and OCP.

Issue: CrunchyData/postgres-operator#2284

CrunchyData/crunchy-containers,CrunchyData/crunchy-containers,CrunchyData/crunchy-containers