[ticket/12880] core.mcp_queue_!is_topics_query_before

Adding core.mcp_queue_!is_topics_query_before

https://tracker.phpbb.com/browse/PHPBB3-12880

PHPBB3-12880
1 element per line:
```
$vars = array(
	'sql',
	'forum_list',
	'visibility_const',
	'topic_id',
	'limit_time_sql',
	'sort_order_sql',
);
```