Undo setting the VSC's deletion policy during backup

It's not necessary to set the deletion policy as the delete item action
plugin in CSI plugin will set it to Delete when the backup is deleted.

Signed-off-by: Daniel Jiang <jiangd@vmware.com>

pkg/controller/backup_controller.go

@@ -1045,8 +1045,6 @@ func (c *backupController) recreateVolumeSnapshotContent(vsc *snapshotv1api.Volu
 		Namespace:  "ns-" + string(vsc.UID),
 		Name:       "name-" + string(vsc.UID),
 	}
-	// Revert DeletionPolicy to Delete
-	vsc.Spec.DeletionPolicy = snapshotv1api.VolumeSnapshotContentDelete
 	// ResourceVersion shouldn't exist for new creation.
 	vsc.ResourceVersion = ""
 	_, err = c.volumeSnapshotClient.SnapshotV1().VolumeSnapshotContents().Create(context.TODO(), vsc, metav1.CreateOptions{})