blind-from-birth fix

blind-from-birth fix

The Blindfolded_only macro didn't track u.uroleplay.blind so would
give a false positive if wearing a blindfold, not able to see due to
the blind option, and not afflicted with any other blindness factors.
Dipping a worn blindfold into holy or unholy water is supposed to
reveal a glow if that blindfold is the only reason for blindness but
the glow was described even when blind-from-birth.

There's no feedback at all when the glow isn't seen.  I'm punting on
that one.  (This change didn't introduce that, just added one extra
situation where it happens.)