pgsql: Remove event trigger from object_address test

Remove event trigger from object_address test

It is causing trouble when run in parallel mode, because dropping the
function other sessions are running concurrently causes them to fail due
to inability to find the function.

Per buildfarm, as noted by Tom Lane.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/289121a452e3c255e4fd63dbb0252261605c2eaf

Modified Files
--------------
src/test/regress/expected/object_address.out |    7 ++-----
src/test/regress/sql/object_address.sql      |    5 +----
2 files changed, 3 insertions(+), 9 deletions(-)