message: Fix warnings in StructureListBox drawItem
diff: @@ -23,9 +23,10 @@ static void drawItem(Renderer& renderer, StructureListBox::StructureListBoxItem&
  const auto& structureColor = structureColorFromIndex(structure->state());
  const auto& structureTextColor = structureTextColorFromIndex(structure->state());
  + const auto highlightColor = NAS2D::Color{structureColor.red, structureColor.green, structureColor.blue, 75};
  // draw highlight rect so as not to tint/hue colors of everything else
  - if (highlight) { renderer.drawBoxFilled(x, y - offset, w, LIST_ITEM_HEIGHT, structureColor.red, structureColor.green, structureColor.blue, 75); }
  + if (highlight) { renderer.drawBoxFilled(NAS2D::Rectangle{x, y - offset, w, LIST_ITEM_HEIGHT}, highlightColor); }
  renderer.drawBox(NAS2D::Rectangle{x + 2, y + 2 - offset, w - 4, LIST_ITEM_HEIGHT - 4}, structureColor);
  