[MC1272] detects spectators

[LadyCailinBot]

CRAFTBOOK-3149 - Reported by jjkrause

(Please switch this issue to CraftBook, as I can only create it under WorldGuard for some reason). I have some games that use the [MC1272] player detector to perform certain actions when a player is near, but the invisible spectators in "/gamemode spectator" can trigger these actions by flying around the detector. I think spectators shouldn't trigger the player detector as they are only spectating. Thanks.