tests: Pull things via http instead of local pulls
tests: Pull things via http instead of local pulls

This causes us to use the same codepaths as in real use.
Also, there seems to be an issue with partial pulls for local remotes.

matthiasclasen/flatpak,flatpak/flatpak,amigadave/flatpak,matthiasclasen/flatpak,handsome-feng/flatpak,handsome-feng/flatpak,flatpak/flatpak,amigadave/flatpak,GeorgesStavracas/flatpak,GeorgesStavracas/flatpak,flatpak/flatpak,GeorgesStavracas/flatpak,GeorgesStavracas/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,handsome-feng/flatpak,amigadave/flatpak,handsome-feng/flatpak,handsome-feng/flatpak,GeorgesStavracas/flatpak,flatpak/flatpak,amigadave/flatpak,matthiasclasen/flatpak