WEBTORRENT_ANNOUNCE global should not override default tracker list
WEBTORRENT_ANNOUNCE global should not override default tracker list

Fixes https://github.com/feross/webtorrent-hybrid/pull/11

rom1504/webtorrent,joshterrill/webtorrent,feross/webtorrent,jamesliu96/webtorrent,arestov/webtorrent,webtorrent/webtorrent,joshterrill/webtorrent,jamesliu96/webtorrent,yciabaud/webtorrent,yciabaud/webtorrent,feross/webtorrent,webtorrent/webtorrent