wesnoth: remove enableTools option as it was removed from wesnoth

pkgs/games/wesnoth/default.nix

@@ -1,7 +1,6 @@
 { lib, stdenv, fetchFromGitHub, cmake, pkg-config, SDL2, SDL2_image, SDL2_mixer, SDL2_net, SDL2_ttf
 , pango, gettext, boost, libvorbis, fribidi, dbus, libpng, pcre, openssl, icu
 , Cocoa, Foundation
-, enableTools ? false
 }:
 
 stdenv.mkDerivation rec {
@@ -21,8 +20,6 @@ stdenv.mkDerivation rec {
                   libvorbis fribidi dbus libpng pcre openssl icu ]
                 ++ lib.optionals stdenv.isDarwin [ Cocoa Foundation];
 
-  cmakeFlags = [ "-DENABLE_TOOLS=${if enableTools then "ON" else "OFF"}" ];
-
   meta = with lib; {
     description = "The Battle for Wesnoth, a free, turn-based strategy game with a fantasy theme";
     longDescription = ''