corrected syntax for autooptimizestore.

configuration.nix

@@ -200,3 +200,4 @@
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
   system.stateVersion = "22.05"; # Did you read the comment?
 
+}

extra-nixos.nix

@@ -18,6 +18,5 @@
     };
     settings.auto-optimize-store = true;
   };
+  
 }
-
-}