[Bug]: Setting storage class in DSPO for mariadb/minio fails due to indentation issues

[HumairAK]

The error in dspo logs when storageclass is set:

2023-12-12T17:57:07Z	ERROR	Reconciler error	{"controller": "datasciencepipelinesapplication", "controllerGroup": "datasciencepipelinesapplications.opendatahub.io", "controllerKind": "DataSciencePipelinesApplication", "DataSciencePipelinesApplication": {"name":"sample","namespace":"dspa"}, "namespace": "dspa", "name": "sample", "reconcileID": "2eaa4e56-1f1d-4c46-8599-c1d081c9db52", "error": "error loading template (minio/pvc.yaml.tmpl) yaml: error converting YAML to JSON: yaml: line 11: did not find expected key"}
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
	/opt/app-root/src/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.13.0/pkg/internal/controller/controller.go:326
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
	/opt/app-root/src/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.13.0/pkg/internal/controller/controller.go:273
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
	/opt/app-root/src/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.13.0/pkg/internal/controller/controller.go:234

this is because the storageClassName indent is wrong so the spec doesn't recognize this field.