Description of problem:
Tried to change the default storage class by editing the storage class but it does not allow to set the storageclass.kubernetes.io/is-default-class to false.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. There are multiple storage classes in the cluster with one of them as default
2. Create a new storage class and make it default by storageclass.kubernetes.io/is-default-class: true
3. Edit the existing default storage class to make ot non-default by storageclass.kubernetes.io/is-default-class: false

Actual results:
Both the new and old classes are marked as default as the edit of old class fails.
ibmc-vpc-block-10iops-tier (default)       vpc.block.csi.ibm.io                    Delete          WaitForFirstConsumer   true                   24d

ibmc-vpc-block-general-purpose (default)   vpc.block.csi.ibm.io                    Delete          Immediate              true                   19h

Expected results:
The old class should have become non-default while the new one should be default


Additional info:
I0322 05:05:22.472650       1 event.go:285] Event(v1.ObjectReference{Kind:"Deployment", Namespace:"openshift-cluster-csi-drivers", Name:"ibm-vpc-block-csi-driver-operator", UID:"af1884cc-829e-4817-8346-f12a2785c535", APIVersion:"apps/v1", ResourceVersion:"", FieldPath:""}): type: 'Normal' reason: 'StorageClassUpdated' Updated StorageClass.storage.k8s.io/ibmc-vpc-block-10iops-tier because it changed
error: unexpected EOF


After editing when I check the SC details, I am able to see the changes has not reflected
ibmc-vpc-block-10iops-tier (default)       vpc.block.csi.ibm.io                    Delete          WaitForFirstConsumer   true                   24d

ibmc-vpc-block-general-purpose (default)   vpc.block.csi.ibm.io                    Delete          Immediate              true                   19h