Always show the cauterize choice in the `a`pply knife menu.

Since i'm in the code, one thing that bothered me as a newcomer to the game was not knowing what or how to cauterize something. Also, the code seemed like it might be useful in its own function for versatility down the line (much like the cauterize_elect that I copied).

Nothing else has changed in the logic. Non masochists still can't cauterize themselves whenever.