Avoid possible infinite recursion

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

hosts/common/user/configs/gui/theme/default.nix

@@ -1,5 +1,5 @@
 {
-  user ? throw "user argument is required",
+  username ? throw "username argument is required",
 }:
 {
   config,
@@ -9,11 +9,12 @@
   ...
 }:
 let
-  hmConfig = config.home-manager.users.${user.name};
+  userConfig = config.users.users.${username};
+  hmConfig = config.home-manager.users.${username};
   themeBin = lib.meta.getExe hmConfig.theme.pkg;
 in
 {
-  home-manager.users.${user.name} = {
+  home-manager.users.${username} = {
     imports = [ ./options.nix ];
 
     theme.enable = true;
@@ -27,7 +28,9 @@ in
       activation.themeInit = inputs.home-manager.lib.hm.dag.entryAfter [
         "writeBoundary"
       ] "run ${themeBin}";
-      persistence."/persist${user.home}".directories = [ "${hmConfig.xdg.relativeConfigHome}/theme" ];
+      persistence."/persist${userConfig.home}".directories = [
+        "${hmConfig.xdg.relativeConfigHome}/theme"
+      ];
     };
   };
 }