libostree: Fix ostree_deployment_clone() to also clone bootconfig
libostree: Fix ostree_deployment_clone() to also clone bootconfig

This way one can easily mutate it for a new deployment list.

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