Add an SD Card stop function, use in ultralcd

Marlin/cardreader.cpp

   if (sdprinting) sdprinting = false;
 }
 
+void CardReader::stopSDPrint() {
+  if (sdprinting) {
+    sdprinting = false;
+    file.close();
+  }
+}
+
 void CardReader::openLogFile(char* name) {
   logging = true;
   openFile(name, false);

Marlin/cardreader.h

   void openAndPrintFile(const char *name);
   void startFileprint();
   void pauseSDPrint();
+  void stopSDPrint();
   void getStatus();
   void printingHasFinished();
 

Marlin/ultralcd.cpp

     }
 
     static void lcd_sdcard_stop() {
-      stepper.quick_stop();
-      #if DISABLED(DELTA) && DISABLED(SCARA)
-        set_current_position_from_planner();
-      #endif // !DELTA && !SCARA
+      card.stopSDPrint();
       clear_command_queue();
-      card.sdprinting = false;
-      card.closefile();
+      stepper.quick_stop();
       print_job_timer.stop();
       thermalManager.autotempShutdown();
       cancel_heatup = true;
       lcd_setstatus(MSG_PRINT_ABORTED, true);
+      #if DISABLED(DELTA) && DISABLED(SCARA)
+        set_current_position_from_planner();
+      #endif // !DELTA && !SCARA
     }
 
   #endif //SDSUPPORT