Aggro LOS fix (maybe..?)

[Derision]

In testing this I would concentrate in dungeons, if you haven't already done this, bearing in mind there
is no pathing for aggroed mobs.

E.g. If I pull a mob and there is a mob around the corner that can't see me, but is within assist range
of the mob I am pulling, with this change, the unseen mob will run straight at me through the walls.

Should this second mob itself yell for help while it is 'running through the walls', possibly through
another room filled with mobs, there may be a chance of a chain-aggro event which pulls a load of mobs
through the walls.

I've not tested this or studied the YellForHelp code, but it is just a thought I had while wondering why
things are coded the way they are.