switch: Always allow chronological downgrades
switch: Always allow chronological downgrades

Ideally we'd have something a bit more strict, but...without
downloading the parentage, this is all we can do at the moment.

sujitfulse/ostree,sujitfulse/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,resin-io/ostree,GNOME/ostree,GNOME/ostree,gatispaeglis/ostree,GNOME/ostree,sujitfulse/ostree,resin-io/ostree,leandrosansilva/ostree,resin-io/ostree,leandrosansilva/ostree,resin-io/ostree,gatispaeglis/ostree,leandrosansilva/ostree,sujitfulse/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,leandrosansilva/ostree,resin-io/ostree,sujitfulse/ostree,leandrosansilva/ostree