OpenFile: Rewrite app paths in /usr and /app (and /newroot)
OpenFile: Rewrite app paths in /usr and /app (and /newroot)

These are not mapped 1-to-1 between apps and the host, so we
use the app-info app-path and runtime-path to rewrite the paths
to a location that matches the host side.

Also, flatpak apps report paths in /newroot, so we skip this prefix

matthiasclasen/xdg-desktop-portal,matthiasclasen/xdg-desktop-portal,matthiasclasen/xdg-desktop-portal,matthiasclasen/xdg-desktop-portal,flatpak/xdg-desktop-portal,flatpak/xdg-desktop-portal,flatpak/xdg-desktop-portal,matthiasclasen/xdg-desktop-portal,flatpak/xdg-desktop-portal