factorio: add name as arg to authenticatedFetch

pkgs/games/factorio/fetch.nix

@@ -8,6 +8,8 @@
   # URL to fetch.
   url ? ""
 
+, name ? "factorio.tar.gz"
+
   # Login URL.
 , loginUrl ? "https://www.factorio.com/login"
 
@@ -16,11 +18,9 @@
 }:
 
 stdenv.mkDerivation {
-  name = "factorio.tar.gz";
-
   buildInputs = [ curl xidel ];
 
-  inherit url loginUrl username password cacert;
+  inherit name url loginUrl username password cacert;
 
   builder = ./fetch.sh;