Revert "python3Packages.ipython: disable clipboard test on darwin (targeting master)"

This reverts commit 6e1e1ddf070a703c51f77ffa7aa176c339dc055a.

cc #162047

pkgs/development/python-modules/ipython/default.nix

···
 , testpath
 }:
 
-buildPythonPackage (rec {
+buildPythonPackage rec {
   pname = "ipython";
   version = "8.0.1";
   format = "pyproject";
···
     license = licenses.bsd3;
     maintainers = with maintainers; [ bjornfor fridh ];
   };
-} // lib.optionalAttrs stdenv.isDarwin {
-  disabledTests = [
-    "test_clipboard_get" # uses pbpaste
-  ];
-})
+}