After-merge fix for rocksdb

Adjust a test for the merge commit e6bdf77e

storage/rocksdb/mysql-test/rocksdb/r/cardinality.result

 # restart
+set use_stat_tables= 'COMPLEMENTARY';
 CREATE TABLE t0 (id int PRIMARY KEY, a int, INDEX ix_a (a))  engine=rocksdb;
 insert into t0 values (0, 0),(1, 1),(2, 2),(3, 3),(4, 4),
 (5, 4),(6, 4),(7, 4),(8, 4),(9, 4);

storage/rocksdb/mysql-test/rocksdb/t/cardinality.test

@@ -2,6 +2,8 @@
 
 --source include/restart_mysqld.inc
 
+set use_stat_tables= 'COMPLEMENTARY';
+
 # Test memtable cardinality statistics
 CREATE TABLE t0 (id int PRIMARY KEY, a int, INDEX ix_a (a))  engine=rocksdb;