fix possible bug in aipursue

apps/openmw/mwmechanics/aipursue.cpp

@@ -55,7 +55,7 @@ bool AiPursue::execute (const MWWorld::Ptr& actor, CharacterController& characte
     float pathTolerance = 100.0;
 
     if (pathTo(actor, dest, duration, pathTolerance) &&
-        MWMechanics::distance(dest,aPos.pos[0],aPos.pos[1],aPos.pos[2]) < pathTolerance)  // check the true distance in case the target is far away in Z-direction
+        abs(dest.mZ - aPos.pos[2]) < pathTolerance)      // check the true distance in case the target is far away in Z-direction
     {
         target.getClass().activate(target,actor).get()->execute(actor); //Arrest player when reached
         return true;