pgsql: Fix improper display of fractional seconds in interval values

Log Message:
-----------
Fix improper display of fractional seconds in interval values
when using --enable-integer-datetimes and a non-ISO datestyle.

Ron Mayer

Modified Files:
--------------
pgsql/src/backend/utils/adt:
datetime.c (r1.194 -> r1.195)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/datetime.c?r1=1.194&r2=1.195)