src: remove unused IsolateSettings variable

PR-URL: #33417
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: danbev

src/node_main_instance.cc

@@ -198,8 +198,7 @@ std::unique_ptr<Environment> NodeMainInstance::CreateMainEnvironment(
     context =
         Context::FromSnapshot(isolate_, kNodeContextIndex).ToLocalChecked();
     InitializeContextRuntime(context);
-    IsolateSettings s;
-    SetIsolateErrorHandlers(isolate_, s);
+    SetIsolateErrorHandlers(isolate_, {});
   } else {
     context = NewContext(isolate_);
   }