python3.pkgs.ete3: remove pyqt4

pkgs/development/python-modules/ete3/default.nix

···
 , withTreeVisualization ? false
 , lxml
 , withXmlSupport ? false
-, pyqt4
 , pyqt5
 }:
 
···
   pythonImportsCheck = [ "ete3" ];
 
   propagatedBuildInputs = [ six numpy ]
-    ++ lib.optional withTreeVisualization (if isPy3k then pyqt5 else pyqt4)
+    ++ lib.optional withTreeVisualization pyqt5
     ++ lib.optional withXmlSupport lxml;
 
   meta = with lib; {