Change ly to file rather than folder to avoid config being written to incorrect path

modules/system/services/general/displaymanager/default.nix

@@ -5,6 +5,6 @@
       enable = true;
       settings.vi_mode = true;
     };
-    environment.persistence."/persist".directories = [ "/etc/ly" ];
+    environment.persistence."/persist".files = [ "/etc/ly/save.ini" ];
   };
 }