Fix an unstable test

h2/src/test/org/h2/test/scripts/functions/window/row_number.sql

@@ -88,7 +88,7 @@ INSERT INTO TEST VALUES
     (4, 'b', 8);
 > update count: 4
 
-SELECT ROW_NUMBER() OVER() RN, TYPE, SUM(CNT) SUM FROM TEST GROUP BY TYPE;
+SELECT ROW_NUMBER() OVER(ORDER /**/ BY TYPE) RN, TYPE, SUM(CNT) SUM FROM TEST GROUP BY TYPE;
 > RN TYPE SUM
 > -- ---- ---
 > 1  a    1