change NPC bodyguard hunt radius to C::VIEW_DISTANCE
change NPC bodyguard hunt radius to C::VIEW_DISTANCE

Previously this was hardcoded to 5.

Instead of staying within 5 rooms of their protect target, bodyguard
NPCs now attempt to stay within viewing distance of them. This might be
decreased in the future, for example, to VIEW_DISTANCE * .75.

JimViebke/IslandMUD,JimViebke/IslandMUD,JimViebke/IslandMUD,JimViebke/IslandMUD