zeusminer: Identify the Chip # both in the UI and RPC API

![ZeusMiner Stats](http://www.nwoolls.com/othercontent/BFGMiner%20ZeusMiner%20Per-Core-Chips-IDd.png)
devdetails doesn't call this at all. (device->device == device) simply means it's the first proc...
(also suggest renaming the var to proc)