message: Also hide the scroll marks when hiding the scrollbar
  This one's pretty obvious. I added another scrollbar sized grid to the terminal,
  but I forgot to collapse it when the user requests `"scrollbarState": "hidden"`.
  * [x] Closes
  * [x] I work here
diff: @@ -432,12 +432,14 @@ namespace winrt::Microsoft::Terminal::Control::implementation
  // achieve the intended effect.
  ScrollBar().IndicatorMode(Controls::Primitives::ScrollingIndicatorMode::None);
  ScrollBar().Visibility(Visibility::Collapsed);
  + ScrollMarksGrid().Visibility(Visibility::Collapsed);
  }
  else // (default or Visible)
  {
  // Default behavior
  ScrollBar().IndicatorMode(Controls::Primitives::ScrollingIndicatorMode::MouseIndicator);
  ScrollBar().Visibility(Visibility::Visible);
  + ScrollMarksGrid().Visibility(Visibility::Visible);
  }
  _interactivity.UpdateSettings();
  