Path for F24 ostree vs F23 ostree

[Dusty Mabe]

I've noticed we switched up the path to the ref for Fedora 24 vs Fedora 23 atomic.


https://dl.fedoraproject.org/pub/fedora/linux/atomic/23/refs/heads/fedora...
https://dl.fedoraproject.org/pub/fedora/linux/atomic/24/refs/heads/fedora...


Was this intentional?