misc improvements to modularity

modules/features/hardware/steam-controller.nix

@@ -5,7 +5,7 @@
 
   flake.nixosModules.gaming = { pkgs, config, lib, ... }: {
     config = lib.mkIf (config.features.hardware.steam-controller.enable) {
-      home-manager.users.grey = lib.mkIf (config.features.nixos.home-manager.enable) {
+      home-manager.users.${config.info.userName} = lib.mkIf (config.features.nixos.home-manager.enable) {
         features.hardware.steam-controller.enable = lib.mkDefault true;
       };
     };