flatpak: fix flatpak-spawn --clear-env

Chromium Flatpak package uses flatpak-spawn command for sandboxing
the child processes. The command comes from flatpak-xdg-utils, which is
presumably included in Flatpak runtimes. The command then calls Spawn
method of the portal.

The portal supports running commands in a clear environment when passed
FLATPAK_SPAWN_FLAGS_CLEAR_ENV flag. Unfortunately, that also clears PATH,
which is probably what prevents `flatpak` command itself from being found.

There is a relevant TODO note in the code:
https://github.com/flatpak/flatpak/blob/1.10.2/portal/flatpak-portal.c#L995-L999

For now, let’s hardcode the path to the binary.

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