bug: quickget downloads .ociarchive files instead of .iso files for Fedora Atomic Editions

[azmodude]

I confirm this bug has not already been reported
It was reported in #1257 and was (temporarily) fixed in #1362

Describe the bug
quickget downloads a .ociarchive image for Fedora Atomic Editions - resulting in a non-bootable VM.

To Reproduce

$ ./quickget Fedora 41 Silverblue
Downloading Fedora 41 Silverblue
- URL: https://mirror.dogado.de/fedora/linux/releases/41/Silverblue/x86_64/images/Fedora-Silverblue-41.1.4.ociarchive
#######                                                                                                                                                                                                                                                     [...]

$ ./quickget Fedora 40 Silverblue
Downloading Fedora 40 Silverblue
- URL: https://mirror.dogado.de/fedora/linux/releases/40/Silverblue/x86_64/images/Fedora-Silverblue-40.1.14.ociarchive
#                                                                                                                                                                                                                                                           [...]

$ ./quickget Fedora 40 Kinoite   
Downloading Fedora 40 Kinoite
- URL: https://mirror.23m.com/fedora/linux/releases/40/Kinoite/x86_64/images/Fedora-Kinoite-40.1.14.ociarchive
#                                                                
[...]

Expected behavior
An .iso file is downloaded to produce a bootable VM.

---

#1362 tried to fix the problem by checking for an empty .sha256 field - it seems like Fedora is producing these now for the .ociarchive builds.

[...]
{
  "version": "41",
  "arch": "x86_64",
  "link": "https://download.fedoraproject.org/pub/fedora/linux/releases/41/Kinoite/x86_64/images/Fedora-Kinoite-41.1.4.ociarchive",
  "variant": "Kinoite",
  "subvariant": "Kinoite",
  "sha256": "284a235a73171b94f3f5fe7893900628d31e9aa0a8cee915b595e57200987168",
  "size": "2850653184"
}

  "version": "41",
  "arch": "x86_64",
  "link": "https://download.fedoraproject.org/pub/fedora/linux/releases/41/Kinoite/x86_64/iso/Fedora-Kinoite-ostree-x86_64-41-1.4.iso",
  "variant": "Kinoite",
  "subvariant": "Kinoite",
  "sha256": "2564128747a62dc642409c1e52f60d281c853069b1833e9c85d6abce4b3cd89d",
  "size": "3752888320"
}

Since the .ociarchive is provided in front of the .iso, quickget always gets the wrong .ociarchive.