gnome: Get rid of with

It can mask unknown variable errors.

pkgs/desktops/gnome/default.nix

@@ -1,7 +1,11 @@
 { config, pkgs, lib }:
 
 # NOTE: New packages should generally go to top-level instead of here!
-lib.makeScope pkgs.newScope (self: with self; {
+lib.makeScope pkgs.newScope (self:
+let
+  inherit (self) callPackage;
+in
+{
   updateScript = callPackage ./update.nix { };
 
   # Temporary helper until gdk-pixbuf supports multiple cache files.
@@ -9,7 +13,7 @@ lib.makeScope pkgs.newScope (self: with self; {
   _gdkPixbufCacheBuilder_DO_NOT_USE = callPackage ./gdk-pixbuf-cache-builder.nix { };
 
   libsoup = pkgs.libsoup.override { gnomeSupport = true; };
-  libchamplain = pkgs.libchamplain.override { libsoup = libsoup; };
+  libchamplain = pkgs.libchamplain.override { inherit (self) libsoup; };
 
 # ISO installer
 # installerIso = callPackage ./installer.nix {};