Add M524 to abort SD printing (#12155)

Marlin/src/lcd/ultralcd.cpp

@@ -895,11 +895,9 @@ void lcd_quick_feedback(const bool clear_buttons) {
       lcd_reset_status();
     }
 
-    bool abort_sd_printing; // =false
-
     void lcd_sdcard_stop() {
       wait_for_heatup = wait_for_user = false;
-      abort_sd_printing = true;
+      card.abort_sd_printing = true;
       lcd_setstatusPGM(PSTR(MSG_PRINT_ABORTED), -1);
       lcd_return_to_status();
     }