Description of problem:
PVC size is not readable while selecting "PVC (creates PVC)" in disk modal

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

How reproducible:

Steps to Reproduce:
1. add a disk to vm
2. select source "PVC (creates PVC)"
3. select a PVC

Actual results:
the size field is loaded with a large number like "1073741824" and unit 'B'

Expected results:
the size is loaded with a proper number like 30 and unit 'GiB'

Additional info: