fix "Host *" generated twice in ssh config

closes #15

home.nix

@@ -137,10 +137,8 @@ in
         "handjecontantje" = lib.hm.dag.entryBefore [ "*" ] {
           hostname = "handjecontantje.dmz";
         };
-        "*" = {
-          user = "root";
-        };
       };
+      extraConfig = "User root";
     };
   };