pg_listener attribute number #defines

It appears that, for no particularly good reason, pg_listener.h
deviates from the usual convention for declaring attribute number
constants.  Normally, it's

#define Anum_{catalog-name}_{column-name}  {attribute-number}

pg_listener.h, however substitutes a different string that is similar,
but not the same as, the column name.

Suggested patch attached.

...Robert