betanin: add glib

Some clients are encountering 'Namespace Gio not available' in
pygobject. Definitions for gio-2.0 are in glib.

pkgs/by-name/be/betanin/package.nix

@@ -3,6 +3,7 @@
 , fetchFromGitHub
 , python3
 , beets
+, glib
 }:
 
 let
@@ -70,6 +71,7 @@ python3.pkgs.buildPythonApplication {
     toml
   ]) ++ [
     beets
+    glib
   ];
 
   meta = {