folks: Use GTK 4 variant of e-d-s
folks: Use GTK 4 variant of e-d-s

It does not really matter since folks does not use libedataserverui,
but we are aiming for not using gtk3 variant of e-d-s in GNOME ISO.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs