Avoid possible infinite recursion

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/user/configs/console/home-manager/default.nix

@@ -1,5 +1,5 @@
 {
-  user ? throw "user argument is required",
+  username ? throw "username argument is required",
 }:
 { config, inputs, ... }:
 {
@@ -14,7 +14,7 @@
     backupFileExtension = "bak";
     useGlobalPkgs = true;
 
-    users.${user.name} = {
+    users.${username} = {
       home.stateVersion = "24.05";
       systemd.user.startServices = "sd-switch";
       nix.settings = config.nix.settings;