pgsql: fix suppress_redundant_updates_trigger() where relation has Oids,

Log Message:
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fix suppress_redundant_updates_trigger() where relation has Oids, per gripe from KaiGai Kohei

Modified Files:
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pgsql/src/backend/utils/adt:
trigfuncs.c (r1.2 -> r1.3)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/trigfuncs.c?r1=1.2&r2=1.3)
pgsql/src/test/regress/expected:
triggers.out (r1.25 -> r1.26)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/triggers.out?r1=1.25&r2=1.26)
pgsql/src/test/regress/sql:
triggers.sql (r1.14 -> r1.15)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/triggers.sql?r1=1.14&r2=1.15)