Fix JWM source URL

pkgs/applications/window-managers/jwm/default.nix

···
   name = "jwm-2.2.2";
   
   src = fetchurl {
-     url = "http://www.joewing.net/programs/jwm/releases/${name}.tar.xz";
+     url = "http://www.joewing.net/projects/jwm/releases/${name}.tar.xz";
      sha256 = "0nhyy78c6imk85d47bakk460x0cfhkyghqq82zghmb00dhwiryln";
   };