message: Factor out expression for truck button visibility
diff: @@ -325,15 +325,11 @@ void MineReport::updateManagementButtonsVisiblity()
  btnDigNewLevel.visible(isVisible);
  btnTakeMeThere.visible(isVisible);
  - btnAddTruck.visible(isVisible);
  - btnRemoveTruck.visible(isVisible);
  + bool isTruckButtonVisible = isVisible &&
  + !(mSelectedFacility->destroyed() || mSelectedFacility->underConstruction());
  - if (isVisible &&
  - (mSelectedFacility->destroyed() || mSelectedFacility->underConstruction()))
  - {
  - btnAddTruck.visible(false);
  - btnRemoveTruck.visible(false);
  - }
  + btnAddTruck.visible(isTruckButtonVisible);
  + btnRemoveTruck.visible(isTruckButtonVisible);
  chkCommonMetals.visible(isVisible);
  chkCommonMinerals.visible(isVisible);
  