Description of problem:
When cloning with volume mode file system, using storage API fails due to resizing.

Version-Release number of selected component (if applicable):
4.10

How reproducible:
100%

Steps to Reproduce:
1. Create DV with file system, using storage api:

apiVersion: cdi.kubevirt.io/v1alpha1
kind: DataVolume
metadata: 
  name: <dv name>
  annotations:
    cdi.kubevirt.io/storage.bind.immediate.requested: "true"
spec: 
  storage: 
    resources: 
      requests: 
        storage: 38Gi
    storageClassName: hostpath-provisioner
  source: 
    http: 
      url: <os image>

2. Create clone

apiVersion: cdi.kubevirt.io/v1beta1
kind: DataVolume
metadata:
  name: dest-dv
spec:
  source:
    pvc:
      name: <DV NAME>
      namespace: <DV NAMESPACE>
  storage:
    resources:
      requests:
        storage: 38Gi
    storageClassName: hostpath-provisioner
  contentType: kubevirt


Actual results:
clone fails: 
The request is invalid: spec.source.PVC: target resources requests storage size is smaller than the source


Expected results:
DV created.

Additional info:
Same clone using PVC API pass