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/lib/ftdi_eve_touch_ui/screens/confirm_user_request_alert_box.cpp

 bool ConfirmUserRequestAlertBox::onTouchEnd(uint8_t tag) {
   switch (tag) {
     case 1:
-      ExtUI::setUserConfirmed();
-      GOTO_PREVIOUS();
+      if (ExtUI::isPrintingPaused()) {
+        // The TuneMenu will call ExtUI::setUserConfirmed()
+        GOTO_SCREEN(TuneMenu);
+        current_screen.forget();
+      }
+      else {
+        ExtUI::setUserConfirmed();
+        GOTO_PREVIOUS();
+      }
       return true;
     case 2: GOTO_PREVIOUS(); return true;
     default:                 return false;

Marlin/src/lcd/extui/lib/ftdi_eve_touch_ui/screens/tune_menu.cpp

 
 void TuneMenu::resumePrint() {
   sound.play(twinkle, PLAY_ASYNCHRONOUS);
-  if (ExtUI::isPrintingFromMedia())
+  if (ExtUI::awaitingUserConfirm())
+    ExtUI::setUserConfirmed();
+  else if (ExtUI::isPrintingFromMedia())
     ExtUI::resumePrint();
   #ifdef ACTION_ON_RESUME
     else host_action_resume();

Marlin/src/lcd/extui/ui_api.cpp

     feedrate_percentage = constrain(value, 10, 500);
   }
 
+  bool awaitingUserConfirm() {
+    return wait_for_user;
+  }
+
   void setUserConfirmed() {
     TERN_(HAS_RESUME_CONTINUE, wait_for_user = false);
   }

Marlin/src/lcd/extui/ui_api.h

   void setTravelAcceleration_mm_s2(const float);
   void setFeedrate_percent(const float);
   void setFlow_percent(const int16_t, const extruder_t);
+  bool awaitingUserConfirm();
   void setUserConfirmed();
 
   #if ENABLED(LIN_ADVANCE)