Minio Operator image pull secrets using wrong helper

The minio-operator values template uses the wrong helper for image pull secrets, causing the wrong YAML structure to be generated.

In chart/templates/minio-operator/values.yaml, the template uses secretsImagePullSecretWithName which produces:

upstream:
  operator:
    imagePullSecret:
      name: private-registry

However, the upstream minio-operator chart expects imagePullSecrets (plural) in list format:

upstream:
  operator:
    imagePullSecrets:
      - name: private-registry