Update ARchitectWindow.js

Dear Wikitude,
I noticed that a little issue occurs every time ARchitectWindow.js is loaded. In fact any POIs are loaded because current position is missing. 
If you want to check it out here you should find a little screenshot (https://www.dropbox.com/s/1zp3hd7zt9zwcqx/image.jpeg?dl=0).

Giacomo.