Fixed stop print LCD function on M104

Marlin/ultralcd.cpp

@@ -19,6 +19,7 @@ int absPreheatHotendTemp;
 int absPreheatHPBTemp;
 int absPreheatFanSpeed;
 
+boolean forced_heating_stop = true ;
 
 #ifdef ULTIPANEL
 static float manual_feedrate[] = MANUAL_FEEDRATE;
@@ -256,6 +257,8 @@ static void lcd_sdcard_stop()
         enquecommand_P(PSTR(SD_FINISHED_RELEASECOMMAND));
     }
     autotempShutdown();
+    
+    forced_heating_stop = false;
 }
 
 /* Menu implementation */