liferea: fix crash when opening file dialogs

The same schema issue as always in gtk3 dialogs.

pkgs/applications/networking/newsreaders/liferea/default.nix

@@ -37,7 +37,7 @@ stdenv.mkDerivation rec {
         --prefix LD_LIBRARY_PATH : "${gnome3.libgnome_keyring}/lib" \
         --prefix GI_TYPELIB_PATH : "$GI_TYPELIB_PATH" \
         --prefix GIO_EXTRA_MODULES : "${gnome3.dconf}/lib/gio/modules:${glib_networking}/lib/gio/modules" \
-        --prefix XDG_DATA_DIRS : "$XDG_ICON_DIRS:${gnome3.gnome_icon_theme}/share:${gnome3.gsettings_desktop_schemas}/share:$out/share"
+        --prefix XDG_DATA_DIRS : "$XDG_ICON_DIRS:${gnome3.gnome_icon_theme}/share:${gnome3.gsettings_desktop_schemas}/share:${gnome3.gtk}/share:$out/share"
     done
   '';