Update postgresql configs to be compatible with bitnami/postgresql v12.1.5

Versions [5.0.0,5.0.3] of this helm chart had misconfigured values if you had postgresql.enabled set to true and were using the bitnami/postgresql container as your postgres instance. 5.0.4 makes our values.yaml file and other settings consistent with bitnami/postgresql 12.1.5.

If you are providing your own postgresql instance via postgresql.config, your values should be unchanged.