remove stop_heating_wait

Marlin/Configuration_adv.h

 // if CooldownNoWait is defined M109 will not wait for the cooldown to finish
 #define CooldownNoWait true
 
-//Do not wait for M109 to finish when printing from SD card
-//#define STOP_HEATING_WAIT_WHEN_SD_PRINTING
-
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heatingpower, proportional to the extrusion speed.
   // if Kc is choosen well, the additional required power due to increased melting should be compensated.

Marlin/Marlin.h

 extern bool axis_relative_modes[];
 extern float current_position[NUM_AXIS] ;
 extern float add_homeing[3];
-extern bool stop_heating_wait;
 
 // Handling multiple extruders pins
 extern uint8_t active_extruder;

Marlin/Marlin.pde

 float current_position[NUM_AXIS] = { 0.0, 0.0, 0.0, 0.0 };
 float add_homeing[3]={0,0,0};
 uint8_t active_extruder = 0;
-bool stop_heating_wait=false;
 
 //===========================================================================
 //=============================private variables=============================
           }
           manage_heater();
           LCD_STATUS;
-        if(stop_heating_wait) break;
         #ifdef TEMP_RESIDENCY_TIME
             /* start/restart the TEMP_RESIDENCY_TIME timer whenever we reach target temp for the first time
               or when current temp falls outside the hysteresis after target temp was reached */

Marlin/cardreader.cpp

  st_synchronize();
  quickStop();
  sdprinting = false;
- #ifdef STOP_HEATING_WAIT_FOR_SD_PRINTING
- stop_heating_wait=true;
- #endif
  if(SD_FINISHED_STEPPERRELEASE)
  {
    //finishAndDisableSteppers();