hydra-module: Don't rely on su being available.

The su binary is now in a separate output of the shadow package and isn't included in the main output path anymore.

But instead of changing the call to use pkgs.su, we're now entirely dropping the dependency because systemd is already able to execute processes under a specific user by itself.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

Created by  aszlig  on April 10, 2014
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