ncurses: Fix codegen for key names and codes

Adding back arguments, which were missed during the import of ncurses version
6.5, to the code gen awk script.

This is modified from lib_keyname.c and keys.list targets in
contrib/ncurses/ncurses/Makefile.in of
21817992b3314c908ab50f0bb88d2ee750b9c4ac

PR: 280697
Reported by: np
Reviewed by: bapt
Tested by: scf
Fixes: 21817992b331 ncurses: vendor import version 6.5
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D47153