message: Remove unused menu item
diff: @@ -1457,10 +1457,6 @@ void MainWindow::buildMainMenuEdit()
  if (autorotate) {
  ImGui::SliderInt("auto rotate speed", &autorotateSpeed, 1, 100);
  }
  -
  - ImGui::Separator();
  - ImGui::Text("export");
  - ImGui::EndMenu();
  }
  }
  