Corrected rustnet.nix call, moved it to userapps/utils.nix

modules/userapps/utils.nix

@@ -2,7 +2,11 @@
   config,
   pkgs,
   ...
-}: {
+}:
+let
+  rustnet = pkgs.callPackage ../../modules/common/rustnet.nix {};
+in
+{
   programs.neovim = {defaultEditor = true;};
   environment.systemPackages = with pkgs; [
     parallel-disk-usage
@@ -27,5 +31,6 @@
     just
     nh
     tty-clock
+    rustnet
   ];
 }