Also show the tune menu when USB printing.

Marlin/ultralcd.cpp

@@ -180,7 +180,7 @@ static void lcd_main_menu()
 {
     START_MENU();
     MENU_ITEM(back, MSG_WATCH, lcd_status_screen);
-    if (IS_SD_PRINTING)
+    if (movesplanned() || IS_SD_PRINTING)
     {
         MENU_ITEM(submenu, MSG_TUNE, lcd_tune_menu);
     }else{