message: Remove unnecessary early return
  The following if block are harmless if run in this case.
diff: @@ -483,7 +483,6 @@ void MapViewState::onMouseDown(NAS2D::EventHandler::MouseButton button, int x, i
  if (mTooltipSystemButton.rect().contains(MOUSE_COORDS))
  {
  onSystemMenu();
  - return;
  }
  const auto oldDepth = mTileMap->currentDepth();
  