server tests: fix serverType in announceUrl
server tests: fix serverType in announceUrl

LinusU/bittorrent-tracker,maxogden/bittorrent-tracker,jhiesey/bittorrent-tracker,prozacchiwawa/bittorrent-tracker,precisit/bittorrent-tracker,jhiesey/bittorrent-tracker,feross/bittorrent-tracker,feross/bittorrent-tracker