fix "can't enter codes on ScreenTitleMenu if UseDedicatedMenuButtons is on"

stepmania/src/ScreenTitleMenu.cpp

@@ -237,12 +237,12 @@ void ScreenTitleMenu::Input( const DeviceInput& DeviceI, const InputEventType ty
 		return;
 	}
 
-	if( !MenuI.IsValid() )
-		return;
 
 	if( m_In.IsTransitioning() || m_Back.IsTransitioning() ) /* not m_Out */
 		return;
 
+	if( MenuI.IsValid() )
+	{
 		switch( MenuI.button )
 		{
 		case MENU_BUTTON_UP:
@@ -276,6 +276,7 @@ void ScreenTitleMenu::Input( const DeviceInput& DeviceI, const InputEventType ty
 			if( !m_Out.IsTransitioning() )
 				StartTransitioning( SM_GoToNextScreen );
 		}
+	}
 
 	// detect codes
 	if( CodeDetector::EnteredCode(GameI.controller,CodeDetector::CODE_NEXT_THEME) ||