plug luckstone identification hole (trunk only)

plug luckstone identification hole (trunk only)

      From the newsgroup:  when you pick up a gray stone, you can determine
whether it is a luckstone by attempting to name it "the Heart of Ahriman".
Your "fingers slip" if it is, they don't if it isn't.  That's way too
cheesy for my tastes.  This patch will make the finger slipping occur for
any item that has the same description rather than just for the exact type.
Now you won't be able to name any type of gray stone "the Heart of Ahriman"
(nor an elven broadsword "Stormbringer"; however, assuming that you manage
to acquire a non-artifact runesword, you can still uselessly name it
"Orcrist" if you want).