sm64baserom: remove ... from callArgs

pkgs/by-name/sm64baserom/package.nix

@@ -1,10 +1,10 @@
 # "baseRom" (previously) / "sm64baserom" (in the future) is used by `sm64coopdx`, `sm64ex-coop`: braindead packages which use `requireFile` instead of fetching their sources.
-{ fetchurl, ... }:
+{ fetchurl, region ? "us", showRegionMessage ? false }:
 let
-  baserom = fetchurl {
+  baserom.us = fetchurl {
     url = "https://github.com/jb1361/Super-Mario-64-AI/raw/development/Super%20Mario%2064%20(USA).z64";
     hash = "sha256-F84Hc0PGEz+Mny1tbZpKtiyM0qpXxArqH0kLTIuyHZE=";
   };
 in {
-  romPath = "${baserom}";
+  romPath = "${baserom.${region}}";
 }