Fix rocksdb.duplicate_table test

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

@@ -8,7 +8,7 @@ INSERT INTO t values (1), (2), (3);
 CREATE TABLE t(id int primary key) engine=rocksdb;
 FLUSH TABLES;
 move_file $MYSQLTEST_VARDIR/mysqld.1/data/test/t.frm $MYSQLTEST_VARDIR/mysqld.1/data/test/t.frm.tmp;
---error ER_UNKNOWN_ERROR
+--error ER_METADATA_INCONSISTENCY
 CREATE TABLE t(id int primary key) engine=rocksdb;
 move_file $MYSQLTEST_VARDIR/mysqld.1/data/test/t.frm.tmp $MYSQLTEST_VARDIR/mysqld.1/data/test/t.frm;
 FLUSH TABLES;