zdoom: Fix typo from 1cc9d9ef2ce80dee5c8f2ef9f8ae20ae76337d73

pkgs/games/zdoom/default.nix

···
     # Doom source license, MAME license
     license = licenses.unfreeRedistributable;
     platforms = platforms.linux;
-    maintainers = with maintainer;s [ lassulus ];
+    maintainers = with maintainers; [ lassulus ];
   };
 }