common/dconf: move to session.slice

hosts/common/default.nix

@@ -6,6 +6,7 @@ in {
     ./fonts.nix
     ./nix.nix
 
+    ./programs/dconf.nix
     ./programs/gnupg.nix
     ./programs/neovim.nix
     ./programs/nix-ld.nix

hosts/common/programs/dconf.nix

@@ -0,0 +1,9 @@
+{ config, lib, ... }:
+let
+  cfg = config.programs.dconf;
+in
+{
+  programs.dconf.enable = !config.machineVars.headless;
+
+  systemd.user.services.dconf.serviceConfig.slice = lib.mkIf cfg.enable "session.slice";
+}

hosts/common/services/dbus.nix

@@ -5,7 +5,6 @@
     implementation = "broker";
     packages = with pkgs; [
       gcr
-      dconf
     ];
   };
 }