Revert "Fix services.udisks.enable."

This reverts commit 02a30bea44,
necessary after reverting to udisks 1.0.4.

http://hydra.nixos.org/build/10194840

nixos/modules/services/hardware/udisks.nix

@@ -40,8 +40,6 @@ with pkgs.lib;
       '';
 
     services.udev.packages = [ pkgs.udisks ];
-
-    systemd.packages = [ pkgs.udisks ];
   };
 
 }

pkgs/os-specific/linux/udisks/1-default.nix

@@ -19,11 +19,6 @@ stdenv.mkDerivation rec {
       substituteInPlace src/main.c --replace \
         "/sbin:/bin:/usr/sbin:/usr/bin" \
         "${utillinux}/bin:${mdadm}/sbin:/var/run/current-system/sw/bin:/var/run/current-system/sw/sbin"
-
-      # For some reason @libexec@ is set to 'lib/' when building.
-      # Passing --libexecdir in configureFlags didn't help.
-      substituteInPlace data/systemd/udisks.service.in \
-        --replace "@libexecdir@" "$out/libexec"
     '';
 
   buildInputs =