Make sure project manager gets editor hint set

Previous fix in e8e06b2 worked in most cases but not if you run e.g.
'godot -', where the '-' argument would mean that 'project_manager'
is false and yet that's what will be opened eventually.

main/main.cpp

@@ -792,10 +792,6 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 		// Determine if the project manager should be requested
 		project_manager = main_args.size() == 0 && !found_project;
 	}
-
-	if (project_manager) {
-		Engine::get_singleton()->set_editor_hint(true);
-	}
 #endif
 
 	if (main_args.size() == 0 && String(GLOBAL_DEF("application/run/main_scene", "")) == "") {
@@ -1697,6 +1693,7 @@ bool Main::start() {
 #ifdef TOOLS_ENABLED
 		if (project_manager || (script == "" && test == "" && game_path == "" && !editor)) {
 
+			Engine::get_singleton()->set_editor_hint(true);
 			ProjectManager *pmanager = memnew(ProjectManager);
 			ProgressDialog *progress_dialog = memnew(ProgressDialog);
 			pmanager->add_child(progress_dialog);