nixos/steam: ensure Steam picks up font packages

nixos/modules/programs/steam.nix

@@ -55,6 +55,8 @@ in {
             then [ package ] ++ extraPackages
             else [ package32 ] ++ extraPackages32;
         in prevLibs ++ additionalLibs;
+        # ensure font packages are picked up by Steam
+        extraPkgs = (prev.extraPkgs or []) ++ config.fonts.packages;
       } // optionalAttrs (cfg.gamescopeSession.enable && gamescopeCfg.capSysNice)
       {
         buildFHSEnv = pkgs.buildFHSEnv.override {