Lavaes do no damage when they attacking walls

Lavae will try to attack the walls but it do no damage.

The problem is in the scripts/stategraphs/SGlavae.lua,line 129.The function "Doattack" will try to attack the player instead of attack the target wall.

Maybe we can find a solution from scripts/stategraphs/SGLeif.lua.Leif can attack the wall and do damage to the wall when they are blocked buy the wall.