Fix the output box being actually an input box

agui2/src/MainWindow.cpp

@@ -28,7 +28,7 @@ MainWindow::MainWindow()
     Registry::initialize();
     this->scene->addItem(new InputGraphicsBox(std::make_unique<InputModelBox>(), {0, 200}));
-    outputBox = new GraphicsBox(std::make_unique<InputModelBox>(), {400, 200});;
+    outputBox = new GraphicsBox(std::make_unique<OutputModelBox>(), {400, 200});;
     this->scene->addItem(outputBox);
 }