Fixes SR setting SeedIdleLimit no matter what

Any setting will set a SeedIdleLimit in Transmission even if your client default is to not have SeedIdleLimit enabled. This allows a setting of '-1' to bypass setting the SeedIdleLimit thereby not stopping torrent seeding based on this limit.
shouldn't this just be 'if sickbeard.TORRENT_SEED_TIME != -1:' ?