gnome.gnome-music: move python dependencies to pythonPath

It is deprecated but otherwise wrapPython adds everything that is propagated, including dev outputs, to program_PATH, which ends up in the wrapper.

pkgs/desktops/gnome/apps/gnome-music/default.nix

@@ -79,13 +79,12 @@ python3.pkgs.buildPythonApplication rec {
     gst-plugins-ugly
   ]);
 
-  propagatedBuildInputs = with python3.pkgs; [
+  pythonPath = with python3.pkgs; [
     pycairo
     dbus-python
     pygobject3
   ];
 
-
   postPatch = ''
     for f in meson_post_conf.py meson_post_install.py; do
       chmod +x $f