Small update to the customer AI

Very small update: 

Customers now prioritize finding other available elevators on their floor before resorting to using the stairs.

Context/backstory:

I had developed this update about a month ago but haven't uploaded it on Itch till now. For some reasons unknown to me, today the game was pushed up into the Popular page on Itch for web games, and for incremental and idle tags, so I decided to push this small updates as thanks to the people who had played this game. Thank you very much!

I haven't done more development on this game since, but if there's real interest to see this game being updated with more content, please let me know and I will make plans for it. Commenting and rating the game will help a lot!