Default to bare-user-only repo
Default to bare-user-only repo

This means we work on systems without xattrs
Old installations keep using bare-user, and you can use
FLATPAK_OSTREE_REPO_MODE=user to force it.

flatpak/flatpak,handsome-feng/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,handsome-feng/flatpak,handsome-feng/flatpak,flatpak/flatpak,matthiasclasen/flatpak,handsome-feng/flatpak,matthiasclasen/flatpak,handsome-feng/flatpak,matthiasclasen/flatpak