[CSGO] fix regression from v1.5 that made B3 never disconnect leaving players

See http://forum.bigbrotherbot.net/counter-strike-global-offensive/any-way-to-stop-bot-registrations/msg41564/#msg41564
Merge pull request #85 from thomasleveil/csgo_fix_disconnect

[CSGO] fix regression from v1.5 that made B3 never disconnect leaving players