KDE: Do not allow KDE AArch64 images to fail to build
Fedora KDE considers AArch64 release-blocking and wants images
to always exist for AArch64 so we avoid releasing without images.
Reference: https://fedoraproject.org/wiki/Changes/Fedora_KDE_AArch64_ReleaseBlocker
Signed-off-by: Neal Gompa <ngompa@fedoraproject.org>