Fix peers and seeds sorting in transfer list.

An image explains it better. Before:
![2014-01-18-113453_97x127_scrot](https://f.cloud.github.com/assets/236201/1946883/4da723b2-802f-11e3-8a40-4e1bd5f2b104.png)

After this patch:
![2014-01-18-115613_89x151_scrot](https://f.cloud.github.com/assets/236201/1946885/536d094c-802f-11e3-920c-7dc1e1aeb465.png)

When active peers (or seeds) of two torrents are the same we sort by total peers
(or seeds).