Improve filament runout handling in FTDI EVE Touch UI

- On filament runout, take the user to the tune menu where they can initiate a filament change or resume the print.

Marlin/src/lcd/extui/ui_api.cpp

@@ -943,6 +943,10 @@ namespace ExtUI {
     feedrate_percentage = constrain(value, 10, 500);
   }
 
+  bool awaitingUserConfirm() {
+    return wait_for_user;
+  }
+
   void setUserConfirmed() {
     TERN_(HAS_RESUME_CONTINUE, wait_for_user = false);
   }