Fixed counting exception

Fixed "Invalid parameter number: number of bound variables does not match number of tokens " exception during execution count on Query where select part of query contains :parameters.
Doctrine didn't removes it automatically when count is performed on something like this:
return $this->getEntityManager()->createQuery(
            "select r,"
            . "(sum(case when rr.helpful=true then 1 else 0 end)* 100 / (count(rr.helpful)+0.00001)) as hidden percent_cnt,"
            . "(case when (sum(case when rr.helpful=true then 1 else 0 end)* 100 / (count(rr.helpful)+0.00001))>:percent_of_helpfulness and count(rr.helpful)>:minimum_votes then 1 else 0 end) as hidden valuable_cnt"
            . " from MerixGameBundle:Review r left join r.reviewRatings rr"
            . " where r.game = :game group by r.id order by valuable_cnt desc, percent_cnt desc"
        )
            ->setParameter('percent_of_helpfulness', self::PERCENT_OF_HELPFULNESS)
            ->setParameter('minimum_votes', self::MINIMUM_VOTES)
            ->setParameter('game', $game);