Fix --run
Fix --run

I have a manifest which has --command=terminix in the finish-args,
and xdg-app build doesn't like that option, so filter it out.

alexlarsson/xdg-app,matthiasclasen/xdg-app,matthiasclasen/xdg-app,flatpak/flatpak,matthiasclasen/flatpak,handsome-feng/flatpak,GeorgesStavracas/flatpak,amigadave/flatpak,matthiasclasen/xdg-app,handsome-feng/flatpak,handsome-feng/flatpak,handsome-feng/flatpak,GeorgesStavracas/flatpak,matthiasclasen/flatpak,handsome-feng/flatpak,matthiasclasen/xdg-app,flatpak/flatpak,alexlarsson/xdg-app,amigadave/flatpak,alexlarsson/xdg-app,amigadave/flatpak,flatpak/flatpak,GeorgesStavracas/flatpak,GeorgesStavracas/flatpak,alexlarsson/xdg-app,flatpak/flatpak,GeorgesStavracas/flatpak,amigadave/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak