haskellPackages.barbly: fix platforms meta attribute

pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml

···
   alsa-mixer:                                   [ platforms.linux ]
   alsa-pcm:                                     [ platforms.linux ]
   alsa-seq:                                     [ platforms.linux ]
-  barbly:                                       [ platforms.linux ]
+  barbly:                                       [ platforms.darwin ]
   bindings-parport:                             [ platforms.linux ] # parport is a linux kernel component
   blake3:                                       [ platforms.x86 ] # uses x86 intrinsics
   btrfs:                                        [ platforms.linux ] # depends on linux

pkgs/development/haskell-modules/hackage-packages.nix

···
        ];
        description = "Create status bar menus for macOS from executables";
        license = lib.licenses.bsd3;
-       platforms = lib.platforms.linux;
+       platforms = lib.platforms.darwin;
        mainProgram = "barbly";
      }) {};