CSV Change Descriptor of StorageClass From Text to StorageClass

[neevnuv]

SUMMARY

Update only awx-operator.clusterserviceversion.yaml:
Some descriptors for StorageClasses were set as text and not Storage Class:

ISSUE TYPE

• Bug, Docs Fix or other nominal change

ADDITIONAL INFORMATION

Before:

- displayName: Backup PVC Storage Class
        path: backup_storage_class
        x-descriptors:
        - urn:alm:descriptor:com.tectonic.ui:text
        - urn:alm:descriptor:com.tectonic.ui:advanced

After:

- displayName: Backup PVC Storage Class
        path: backup_storage_class
        x-descriptors:
        - urn:alm:descriptor:io.kubernetes:StorageClass
        - urn:alm:descriptor:com.tectonic.ui:advanced

[fosterseth]

@neevnuv thanks for your contribution, good change!