Add ORDER BY to more ICU regression test cases.

Commit c77e12208 didn't fully fix the problem.  Per buildfarm
and local testing.

src/test/regress/expected/collate.icu.utf8.out

@@ -1490,18 +1490,18 @@ SELECT x FROM test2bpci UNION SELECT x FROM test1bpci ORDER BY x;
  ghi
 (3 rows)
 
-SELECT x FROM test1bpci INTERSECT SELECT x FROM test2bpci;
+SELECT x FROM test1bpci INTERSECT SELECT x FROM test2bpci ORDER BY x;
   x  
 -----
- ghi
  abc
+ ghi
 (2 rows)
 
-SELECT x FROM test2bpci INTERSECT SELECT x FROM test1bpci;
+SELECT x FROM test2bpci INTERSECT SELECT x FROM test1bpci ORDER BY x;
   x  
 -----
- ghi
  ABC
+ ghi
 (2 rows)
 
 SELECT x FROM test1bpci EXCEPT SELECT x FROM test2bpci;

src/test/regress/sql/collate.icu.utf8.sql

@@ -548,8 +548,8 @@ SELECT x FROM test3bpci WHERE x SIMILAR TO 'a%';
 SELECT x FROM test3bpci WHERE x ~ 'a';
 SELECT x FROM test1bpci UNION SELECT x FROM test2bpci ORDER BY x;
 SELECT x FROM test2bpci UNION SELECT x FROM test1bpci ORDER BY x;
-SELECT x FROM test1bpci INTERSECT SELECT x FROM test2bpci;
-SELECT x FROM test2bpci INTERSECT SELECT x FROM test1bpci;
+SELECT x FROM test1bpci INTERSECT SELECT x FROM test2bpci ORDER BY x;
+SELECT x FROM test2bpci INTERSECT SELECT x FROM test1bpci ORDER BY x;
 SELECT x FROM test1bpci EXCEPT SELECT x FROM test2bpci;
 SELECT x FROM test2bpci EXCEPT SELECT x FROM test1bpci;
 SELECT DISTINCT x FROM test3bpci ORDER BY x;