mpvScripts.simple-mpv-webui: remove broken symlink

pkgs/applications/video/mpv/scripts/simple-mpv-webui.nix

···
   };
   passthru.updateScript = gitUpdater { rev-prefix = "v"; };
 
+  postInstall = ''
+    rm -f $out/share/mpv/scripts/webui/setup.cfg
+  '';
+
   scriptPath = ".";
   passthru.scriptName = "webui";