Fix portfolio

I am no js coder, so please verify if it won't affect anything else. But with this modification the portfolio manager displays correct values from BTC-e portfolio, without this it just displays zeros by all assets / currencies. 

I have compared the files between version 0.0.7 and the latest and this was the only major change, I have tested it and it works correctly, but I just don't know if it won't affect any other modules / plugins.