dump1090: mark working on darwin

pkgs/applications/radio/dump1090/default.nix

···
   '';
 
   meta = with lib; {
-    broken = stdenv.isDarwin;
     description = "A simple Mode S decoder for RTLSDR devices";
     homepage = "https://github.com/flightaware/dump1090";
     license = licenses.gpl2Plus;