add gamescope for steam

nixos/modules/programs/steam.nix

@@ -1,4 +1,9 @@
-{ lib, config, ... }:
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}:
 let
   cfg = config.youthlic.programs.steam;
 in
@@ -10,6 +15,9 @@ in
   };
   config = lib.mkIf cfg.enable {
     hardware.graphics.enable32Bit = true;
+    environment.systemPackages = with pkgs; [
+      gamescope
+    ];
     programs.steam = {
       enable = true;
       remotePlay.openFirewall = true; # Open ports in the firewall for Steam Remote Play