cheat: fix zsh completion (#347943)

  nativeBuildInputs = [ installShellFiles ];

  patches = [

    (builtins.toFile "fix-zsh-completion.patch" ''

      diff --git a/scripts/cheat.zsh b/scripts/cheat.zsh

      index befe1b2..675c9f8 100755

      --- a/scripts/cheat.zsh

      +++ b/scripts/cheat.zsh

      @@ -62,4 +62,4 @@ _cheat() {

         esac

       }

      -compdef _cheat cheat

      +_cheat "$@"

    '')

  ];

  postInstall = ''

    installManPage doc/cheat.1

    installShellCompletion scripts/cheat.{bash,fish,zsh}