Fix "Stop Print" function in the LCD menu

When one hit "Stop Print" option in LCD menu, the command buffer was not
cleared. The printer keep moving until the buffer has been emptied.
Actually I could not clear the command buffer as well.. I don't know
why, it doesnt work as expected.
I need to implement a routine inside Stepper ISR to handle such
situation.

Marlin/cardreader.cpp

@@ -504,7 +504,6 @@ void CardReader::printingHasFinished() {
     startFileprint();
   }
   else {
-    quickStop();
     file.close();
     sdprinting = false;
     if (SD_FINISHED_STEPPERRELEASE) {