nixos: remove dependencies on local-fs.target

Since https://github.com/NixOS/nixpkgs/pull/61321, local-fs.target is
part of sysinit.target again, meaning units without
DefaultDependencies=no will automatically depend on it, and the manual
set dependencies can be dropped.

nixos/tests/hocker-fetchdocker/machine.nix

@@ -11,8 +11,8 @@
   systemd.services.docker-load-fetchdocker-image = {
     description = "Docker load hello-world-container";
     wantedBy    = [ "multi-user.target" ];
-    wants       = [ "docker.service" "local-fs.target" ];
-    after       = [ "docker.service" "local-fs.target" ];
+    wants       = [ "docker.service" ];
+    after       = [ "docker.service" ];
 
     script = ''
       ${pkgs.hello-world-container}/compositeImage.sh | ${pkgs.docker}/bin/docker load