azure: Generate UEFI-only images
As noted by Neal in the previous PR[0], we need UEFI-only images for
Azure. Switch to the `Fedora-30` profile to align with the existing
UEFI-only image configuration for GCP images.
[0] https://pagure.io/pungi-fedora/pull-request/1161
Signed-off-by: Major Hayden <major@redhat.com>