fix regression test for PgPro 9.6.3 (1C)

Author: funbringer

expected/pathman_mergejoin_0.out

@@ -84,3 +84,8 @@ WHERE j1.dt < '2015-03-01' AND j2.dt >= '2015-02-01' ORDER BY j2.dt;
                ->  Index Scan using num_range_rel_4_pkey on num_range_rel_4 j3_3
 (20 rows)
 
+SET enable_hashjoin = ON;
+SET enable_nestloop = ON;
+DROP SCHEMA test CASCADE;
+NOTICE:  drop cascades to 12 other objects
+DROP EXTENSION pg_pathman;