make wizard hats vulnerable to acid again

[NOOT]

if I recall, at the time that wizard hats became immune to acid, acid still immediately melted items instead of having the green -> gone period. Given that there is a 8~second period for acided items before they despawn, I feel it may be worth reintroducing acid hatting even on a trial period to see how impactful it is. Wizards on the new acid set would still have a small period to getaway even after being hit with a chemglass, and spare hats are far easier to juggle when you have 8 seconds to swap out an item.