change call to expand() to be more rational (and consistent!)

change call to expand() to be more rational (and consistent!)

SCCS-vsn: usr.sbin/sendmail/src/usersmtp.c 8.38
SCCS-vsn: usr.sbin/sendmail/src/headers.c 8.50
SCCS-vsn: usr.sbin/sendmail/src/macro.c 8.10
SCCS-vsn: usr.sbin/sendmail/src/main.c 8.91
SCCS-vsn: usr.sbin/sendmail/src/envelope.c 8.52
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 8.58
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 8.103
SCCS-vsn: usr.sbin/sendmail/src/savemail.c 8.56
SCCS-vsn: usr.sbin/sendmail/src/daemon.c 8.74
SCCS-vsn: usr.sbin/sendmail/src/srvrsmtp.c 8.56
SCCS-vsn: usr.sbin/sendmail/src/readcf.c 8.74
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 8.130
SCCS-vsn: usr.sbin/sendmail/src/queue.c 8.68
SCCS-vsn: usr.sbin/sendmail/src/alias.c 8.39