postcounts from optimize.php

[mmxbass]

The retrieval of postcounts from optimize.php is overly simplistic.

Note the SQL code used for the normal retrieval of threads in bulk.

SELECT `threads`.*, (IFNULL(`t2`.`lastpostdate`,0)+`threads`.`lastpostdate`), (`threads`.`status` &2 ) FROM `threads` LEFT JOIN `threads`=`t2` ON `threads`.`link` = `t2`.`id` WHERE `threads`.`forum`='$forumID' ORDER BY (`threads`.`status` &2 ) DESC, `(IFNULL(``t2``.``lastpostdate``,0)+``threads``.``lastpostdate``)` DESC LIMIT $offset , $tpp");