Fixes Seed Box placement

Fixes seed box placement (they now line up with the username and
password boxes on providers that use these).
Since rtorrent seed ratio has been disabled in sickbeard for a long time
(the code is hashed out in the master branch) I have hidden the ratio
setting box in the rtorrent config page until it gets fixed.
I have also added a method to each torrent client to capture converting
to float errors when setting the seed ratio.