bug#74774: Commit 5d284ebc8df87b0e21cee5844d66dc7c80863464 breaks reconfigure for systems using gnome-desktop-service-type

[paul via Bug reports for GNU Guix]

Hi Danny, thank you so much for the quick action. I'm not sure about the 
right solution for this but maybe the gnome-desktop-service-type should 
install xdg-desktop-portal-next in the system profile instead of 
xdg-desktop-portal? I think this way there wouldn't be any collision but 
it would need some test for sure.