fix B16003 - Oracle only renamable named unique monster

fix B16003 - Oracle only renamable named unique monster

     This makes all unique monsters resist being given a name.  Aside
from the Oracle, the four high priests are the only monsters affected
that weren't already being covered by the old tests.  They might as well
decline to receive names too.

     This also fixes a longstanding quirk that prevented you from
calling a type of object something if the representative sample of it
had been picked up while blind and you hadn't explicitly examined your
inventory since regaining sight.  There's not much point in requiring
an extra 'i' command or use of '?' or '*' at the "what do you want to
call?" prompt, particularly since that makes gameplay be slightly
different depending on whether perm_invent is available and in use.