nixos/kresd: fix systemd dependency cycle

The unnecessary dependency of sockets.target on kresd.service causes a
dependency cycle preventing kresd.service from starting at boot:

sockets.target -> kresd.service -> basic.target -> sockets.target

nixos/modules/services/networking/kresd.nix

@@ -113,7 +113,6 @@ in
 
       after = [ "kresd-cachedir.service" ];
       requires = [ "kresd.socket" "kresd-cachedir.service" ];
-      wantedBy = [ "sockets.target" ];
     };
   };
 }