postgres_fdw: Remove CTID output from some tests.

Commit 1bc0100d added these tests,
but they're not stable enough to survive in the buildfarm.  Remove
CTIDs from the output in the hopes of fixing that.

contrib/postgres_fdw/sql/postgres_fdw.sql

@@ -1109,16 +1109,16 @@ EXPLAIN (verbose, costs off)
 UPDATE ft2 SET c3 = 'foo'
   FROM ft4 INNER JOIN ft5 ON (ft4.c1 = ft5.c1)
   WHERE ft2.c1 > 1200 AND ft2.c2 = ft4.c1
-  RETURNING ft2.ctid, ft2, ft2.*, ft4.ctid, ft4, ft4.*;                             -- can be pushed down
+  RETURNING ft2, ft2.*, ft4, ft4.*;       -- can be pushed down
 UPDATE ft2 SET c3 = 'foo'
   FROM ft4 INNER JOIN ft5 ON (ft4.c1 = ft5.c1)
   WHERE ft2.c1 > 1200 AND ft2.c2 = ft4.c1
-  RETURNING ft2.ctid, ft2, ft2.*, ft4.ctid, ft4, ft4.*;
+  RETURNING ft2, ft2.*, ft4, ft4.*;
 EXPLAIN (verbose, costs off)
 DELETE FROM ft2
   USING ft4 LEFT JOIN ft5 ON (ft4.c1 = ft5.c1)
   WHERE ft2.c1 > 1200 AND ft2.c1 % 10 = 0 AND ft2.c2 = ft4.c1
-  RETURNING 100;                                                                    -- can be pushed down
+  RETURNING 100;                          -- can be pushed down
 DELETE FROM ft2
   USING ft4 LEFT JOIN ft5 ON (ft4.c1 = ft5.c1)
   WHERE ft2.c1 > 1200 AND ft2.c1 % 10 = 0 AND ft2.c2 = ft4.c1
@@ -1146,11 +1146,11 @@ EXPLAIN (verbose, costs off)
 DELETE FROM ft2
   USING ft4 INNER JOIN ft5 ON (ft4.c1 === ft5.c1)
   WHERE ft2.c1 > 2000 AND ft2.c2 = ft4.c1
-  RETURNING ft2.ctid, ft2.c1, ft2.c2, ft2.c3;                                       -- can't be pushed down
+  RETURNING ft2.c1, ft2.c2, ft2.c3;       -- can't be pushed down
 DELETE FROM ft2
   USING ft4 INNER JOIN ft5 ON (ft4.c1 === ft5.c1)
   WHERE ft2.c1 > 2000 AND ft2.c2 = ft4.c1
-  RETURNING ft2.ctid, ft2.c1, ft2.c2, ft2.c3;
+  RETURNING ft2.c1, ft2.c2, ft2.c3;
 DELETE FROM ft2 WHERE ft2.c1 > 2000;
 ALTER SERVER loopback OPTIONS (ADD extensions 'postgres_fdw');