Fix syntax error

muItilingualism · web-flow · commit 42c41cd43d6b · 2024-07-31T23:30:00.000+02:00
diff --git a/nixos-modules/valheim.nix b/nixos-modules/valheim.nix
@@ -86,7 +86,7 @@ in {
     };
 
     preset = lib.mkOption {
-      type = lib.types; nullOr str;
+      type = with lib.types; nullOr str;
       default = null;
       example = "hardcore";
       description = lib.mdDoc ''
