fix(quickget): arm64 support for Fedora editions

Maybe it was accurate in this past but the current Quickget release
suggest that only Fedora Server has arm64 support. That's not the case.
In fact checking the `releases.json` file that `quickget` already uses
shows us that every edition other than Onyx supports arm64.

This PR makes that change.

The command ran to check this info was:

```bash
curl -sL https://getfedora.org/releases.json | jq -r
'group_by(.variant)[] | "\(.[0].variant): \(map(.arch) | unique |
join(", "))"'

COSMIC-Atomic: aarch64, x86_64
Cloud: aarch64, ppc64le, s390x, x86_64
Container: aarch64, ppc64le, s390x, x86_64
Everything: aarch64, ppc64le, s390x, x86_64
IoT: aarch64, ppc64le, s390x, x86_64
KDE: aarch64, ppc64le, x86_64
Kinoite: aarch64, ppc64le, x86_64
Labs: aarch64, x86_64
Onyx: x86_64
Sericea: aarch64, x86_64
Server: aarch64, ppc64le, s390x, x86_64
Silverblue: aarch64, ppc64le, x86_64
Spins: aarch64, x86_64
Workstation: aarch64, ppc64le, x86_64

Author: FelicianoTech

quickget

@@ -1227,8 +1227,8 @@ function arch_debian() {
 
 function arch_fedora() {
     case "${EDITION}" in
-        Server) echo "amd64 arm64";;
-        *) echo "amd64";;
+        Onyx) echo "amd64";;
+        *) echo "amd64 arm64";;
     esac
 }