Adapt python regression tests to 69f4b9c85f.

Hopefully this'll unbreak the buildfarm.

src/pl/plpython/expected/plpython_setof.out

@@ -147,11 +147,8 @@ SELECT ugly(1,3), ugly(7,8);
 ------+------
     1 |    7
     2 |    8
-    3 |    7
+    3 |     
-    1 |    8
+(3 rows)
-    2 |    7
-    3 |    8
-(6 rows)
 
 -- returns set of named-composite-type tuples
 CREATE OR REPLACE FUNCTION get_user_records()