tests: Fix distcheck (test.filter is in srcdir, not builddir)
tests: Fix distcheck (test.filter is in srcdir, not builddir)

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