helper: Remove backwars compat /self symlink
helper: Remove backwars compat /self symlink

We've broken the format anyway.

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