remove stop_heating_wait

Marlin/cardreader.cpp

@@ -447,9 +447,6 @@ void CardReader::printingHasFinished()
  st_synchronize();
  quickStop();
  sdprinting = false;
- #ifdef STOP_HEATING_WAIT_FOR_SD_PRINTING
- stop_heating_wait=true;
- #endif
  if(SD_FINISHED_STEPPERRELEASE)
  {
    //finishAndDisableSteppers();