fix Lift command not playing for autoplay

stepmania/src/ReceptorArrow.cpp

@@ -86,6 +86,8 @@ void ReceptorArrow::DrawPrimitives()
 
 void ReceptorArrow::Step( TapNoteScore score )
 {
+	m_bIsPressed = true;
+
 	m_pReceptorGo->FinishTweening();
 	m_pReceptorWaiting->FinishTweening();
 	m_pReceptorGo->RunCommands( *m_sScoreCommand[score] );