[macOS] Fix "New Window" opening copy of current project instead of Project Manager.

editor/editor_node.cpp

@@ -5335,7 +5335,7 @@ void EditorNode::_global_menu_action(const Variant &p_id, const Variant &p_meta)
 	if (id == GLOBAL_NEW_WINDOW) {
 		if (OS::get_singleton()->get_main_loop()) {
 			List<String> args;
-			args.push_back("-e");
+			args.push_back("-p");
 			String exec = OS::get_singleton()->get_executable_path();
 
 			OS::ProcessID pid = 0;