Use IS_SD_PRINTING() more

Marlin/src/lcd/menu/menu_main.cpp

@@ -88,7 +88,7 @@ void menu_main() {
   #if ENABLED(SDSUPPORT)
     if (card.cardOK) {
       if (card.isFileOpen()) {
-        if (card.sdprinting)
+        if (IS_SD_PRINTING())
           MENU_ITEM(function, MSG_PAUSE_PRINT, lcd_sdcard_pause);
         else
           MENU_ITEM(function, MSG_RESUME_PRINT, lcd_sdcard_resume);