[Fight] Chases targets with wrong LoS flags

Currently the bot chases targets, even if it can shoot through objects. Especially in BGs this looks absolutely retarded.
It should ONLY check for WMO/Spell LoS. Only if the fightclass range is > 8 yards (bigger than melee range) should it walk directly on top of your target. If you can cast through a tree, let it cast through a tree/box/other gameobject.

This will get users banned, if it's not changed and is a really easy fix.

Tested on 3.3.5a