Remove mac-specific kakoune code

kak.nix

@@ -67,6 +67,7 @@ with pkgs; let
 in
 {
   enable = true;
+  package = kak;
   plugins = with kakounePlugins; [
     kakoune-buffers
     kakoune-extra-filetypes
@@ -95,6 +96,4 @@ in
   };
 
   extraConfig = kak-lsp-config-line + "\n" + builtins.readFile ./dotfiles/kakrc ;
-} // (if stdenv.isDarwin then { package = kak; } else {}) # package seems to be broken on unix?
-
-
+}