udiskie: Use python3 (python2 support is deprecated)

pkgs/applications/misc/udiskie/default.nix

···
 { stdenv, fetchFromGitHub, asciidoc-full, gettext
 , gobjectIntrospection, gtk3, hicolor_icon_theme, libnotify, librsvg
-, pythonPackages, udisks2, wrapGAppsHook }:
+, udisks2, wrapGAppsHook
+, buildPythonApplication
+, docopt
+, pygobject3
+, pyyaml
+}:
 
-pythonPackages.buildPythonApplication rec {
+buildPythonApplication rec {
   name = "udiskie-${version}";
   version = "1.7.3";
 
···
   ];
 
   propagatedBuildInputs = [
-    gettext gobjectIntrospection gtk3 libnotify pythonPackages.docopt
-    pythonPackages.pygobject3 pythonPackages.pyyaml udisks2
+    gettext gobjectIntrospection gtk3 libnotify docopt
+    pygobject3 pyyaml udisks2
   ];
 
   postBuild = "make -C doc";

pkgs/top-level/all-packages.nix

···
 
   udevil = callPackage ../applications/misc/udevil {};
 
-  udiskie = callPackage ../applications/misc/udiskie { };
+  udiskie = python3Packages.callPackage ../applications/misc/udiskie { };
 
   sakura = callPackage ../applications/misc/sakura {
     vte = gnome3.vte;