Fixed test sys_vars.all_vars: innodb_large_prefix no longer missing

mysql-test/suite/sys_vars/r/all_vars.result

@@ -11,7 +11,5 @@ There should be *no* long test name listed below:
 select variable_name as `There should be *no* variables listed below:` from t2
 left join t1 on variable_name=test_name where test_name is null;
 There should be *no* variables listed below:
-INNODB_LARGE_PREFIX
-INNODB_LARGE_PREFIX
 drop table t1;
 drop table t2;