Fix operator configs runasuser and runasgroup

[tommasopozzetti]

This commit fixes a typo in the operator's configuration that would lead to the configs spilo_runasuser and spilo_runasgroup to be ignored.

fixes #1359

[FxKu]

👍

[Jan-M]

👍

[FxKu]

Thanks @tommasopozzetti for your contribution 👍

[caiconkhicon]

@FxKu : sorry I know this commit had been merged and added to v1.6.1, but has anyone tested it yet? I tried with v1.6.1 and runasuser and runasgroup were still ignored.

Update: If I use ConfigMap configuration (helm install postgres-operator ./charts/postgres-operator) it does not work, but if I use the CRD configuration (helm install postgres-operator ./charts/postgres-operator -f ./charts/postgres-operator/values-crd.yaml) it works

[cortopy]

Same here with 1.6.2

[FxKu]

Thanks @caiconkhicon and @cortopy for bringing it up again. The omitempty is indeed wrong there and leads to the error. I'll fix it in #1503