Revisiting my extinguisher exploit fix

Created by: Intigracy

Extinguishers firing items from them now take the item's throw_speed into account and triples it.

Logic being that extinguishers only take small w_class items into it to be able to fire, and I can't think of any with a throw_speed past single digits.

This also fixes a nasty bug where using an obj's throw_speed in throw_at would change the throw_speed.