fix bug in peer_connection::second_tick

git-svn-id: http://libtorrent.googlecode.com/svn@10313 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
fix bug in delay-load feature of torrents

git-svn-id: http://libtorrent.googlecode.com/svn@10314 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda