Fix setting greetd user and login shell

flake.nix

@@ -34,6 +34,7 @@
       ({
         config,
         lib,
+        pkgs,
         ...
       }: {
         networking = {inherit hostName;};
@@ -41,8 +42,10 @@
           settings.trusted-users = [primaryUser];
           registry.nixpkgs.flake = nixpkgs;
         };
+        services.greetd.settings.initial_session.user = primaryUser;
         programs.${loginShell}.enable = true;
         users.users.${primaryUser} = {
+          shell = pkgs.${loginShell};
           group = "users";
           isNormalUser = true;
           description = "Evie Litherland-Smith";