fetch_roster_reply_roster_cb: use wocky_contact_equal to check contact
fetch_roster_reply_roster_cb: use wocky_contact_equal to check contact

freedesktop-unofficial-mirror/wocky,noonien-d/wocky,freedesktop-unofficial-mirror/wocky,freedesktop-unofficial-mirror/wocky,noonien-d/wocky,noonien-d/wocky