Fixed stealth/invisibility: npcs could go straight to the target (it still hindered them though)

git-svn-id: http://svn.net-core.org/repos/t-engine4@6790 51575b47-30f0-44d4-a5cc-537603b46e54

game/engines/default/engine/ai/simple.lua

@@ -19,7 +19,6 @@
 
 -- Defines a simple AI building blocks
 -- Target nearest and move/attack it
-
 local Astar = require "engine.Astar"
 
 newAI("move_simple", function(self)