[FL-2131] IR: continuous signal tx on learn scene (#1002)

Co-authored-by: あく <alleteam@gmail.com>

applications/irda/scene/irda_app_scene_ask_back.cpp

@@ -57,6 +57,8 @@ bool IrdaAppSceneAskBack::on_event(IrdaApp* app, IrdaAppEvent* event) {
             app->switch_to_previous_scene();
             consumed = true;
             break;
+        default:
+            break;
         }
     }