Commit c8ed1ac2 ("api: create disks: live import: use format from
storage layer") broke live import from an OVA containing a disk,
because a combined format like 'ova+vmdk' was used for the live-import
disk mapping, leading to failure:
> invalid format 'ova+vmdk' for 'scsi0' mapping
There was also an informational message about the confusion earlier:
> file_size_info: '/mnt/pve/dir/images/135/vm-135-disk-0.vmdk': \
> falling back to 'raw' from unknown format 'ova+vmdk
Fixes: c8ed1ac2 ("api: create disks: live import: use format from storage layer")
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>