Updates grille damages 'Fixes' #796

'Fixes' #796

Decreases unarmed damage to grilles
Increases projectile and item damage to grilles
Makes burn damage deal the same as everything else
Prevents stamina-beams dealing damage to grilles

Values are open to change if anyone has better suggestions for their balance
Changing this line to check for only stamina will have an effect on, say, Ebows, which do tox damage.

I don't particularly care about this, but you should be aware of it.