tests: Check that updating subpaths works
tests: Check that updating subpaths works

This test updates an runtime to the same commit, just
changing the subpaths, and makes sure that works as
expected.

matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak