Merge pull request #118771 from NoctemCat/web_remove_ub_at_exit

[Web] Remove undefined behavior around exit

platform/web/web_main.cpp

@@ -67,9 +67,10 @@ void exit_callback() {
 		main_started = false;
 	}
 	int exit_code = OS_Web::get_singleton()->get_exit_code();
-	memdelete(os);
+	delete os; // We used a normal new, so it needs a normal delete.
 	os = nullptr;
 	godot_cleanup_profiler();
+	emscripten_cancel_main_loop(); // We are exiting in this iteration.
 	emscripten_force_exit(exit_code); // Exit runtime.
 }