nixos-rebuild-ng: do not parse the path part from Flake as a Path

When I first wrote the Flake code for `nixos-rebuild-ng`, I set the
Flake parser to normalize the `foo` part from `foo#host` as a Python's
`pathlib.Path` if this looked like a path. The idea originally was to
improve type-safety and make it easier to compose the path later if
needed.

But, in retrospect this is the wrong thing to do here because there are
so many things that `nix` can do in those cases:
- `foo` can be either a directory or a Flake registry
- #433726

So let's stop being smart here and just assume a plain string. We don't
really get a lot of type-safety or any of the nice things pathlib gives
to us since there isn't any path manipulation going on. Let `nix` itself
handle any translation here.

Fix: #433726.

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