src: remove unused misc variable

This commit removes the unused 'misc' variable from one of the
NodeMainInstance constructors.

Another option could be to add a default argument to
SetIsolateMiscHandlers but I'd like to hear what others think about that
first.

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

src/node_main_instance.cc

@@ -39,8 +39,7 @@ NodeMainInstance::NodeMainInstance(Isolate* isolate,
   isolate_data_ =
       std::make_unique<IsolateData>(isolate_, event_loop, platform, nullptr);
 
-  IsolateSettings misc;
-  SetIsolateMiscHandlers(isolate_, misc);
+  SetIsolateMiscHandlers(isolate_, {});
 }
 
 std::unique_ptr<NodeMainInstance> NodeMainInstance::Create(