fix: Set allowUnfree in example template

Setting required due to redi-search enabled in template

Probably missed in 9f44f81

examples/templates/frappe/apps/pkgs.nix

@@ -23,6 +23,7 @@ let
   pkgs = import nixpkgs.path {
     # wkhtmltopdf
     config.permittedInsecurePackages = ["openssl-1.1.1w"];
+    config.allowUnfree = true;
 
     system = nixpkgs.system;