Don't alter the "Days/Hours Left" display when selling items

The numbers displayed for "Days/Hours Left" are different when selling manufacturing items.  From looking at older versions, it looks like this was used when selling was triggered by setting the # manufactured to infinity (days left would then also be infinity).  The display doesn't really make any sense to me (ahead/behind schedule?), especially now that you can sell items without setting the # produced to be infinity.