Eyes of the Overworld grammar

Eyes of the Overworld grammar

     Putting on the Eyes while blind causes sight to be regained, which in
turn causes xname() to set the dknown bit and start using the previously
unseen object's name.  But obj_is_pname() was being called before xname in
the "you are now wearing ..." message, while dknown was still clear.  So
obj_is_pname thought the name was being suppressed and returned false,
resulting in "an Eyes" instead of "the Eyes".  Fix is to call xname first.