fix plugins.server_audit test for --ps

Author: vuvova

mysql-test/suite/plugins/t/server_audit.test

@@ -42,8 +42,10 @@ select 1,
         3;
 insert into t2 values (1), (2);
 select * from t2;
+--disable_ps_protocol
 --error ER_NO_SUCH_TABLE
 select * from t_doesnt_exist;
+--enable_ps_protocol
 --error 1064
 syntax_error_query;
 drop table renamed_t1, t2;