modify number of planned tests

Author: bipashabg

pgtap/ordering/sloan/no_crash_test.pg

@@ -20,7 +20,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 BEGIN;
 
 UPDATE edges SET cost = sign(cost), reverse_cost = sign(reverse_cost);
-SELECT CASE WHEN NOT min_version('4.0.0') THEN plan(1) ELSE plan(7) END;
+SELECT CASE WHEN NOT min_version('4.0.0') THEN plan(1) ELSE plan(4) END;
 
 PREPARE edges AS
 SELECT id, source, target, cost, reverse_cost  FROM edges;