Fixed that messages are not sorted by last reply (#12243).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11424 e93f8b46-1217-0410-a6f0-8f06a7374b81
Use #per_page instead of #items_per_page.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11425 e93f8b46-1217-0410-a6f0-8f06a7374b81