Prevent one query per User#member_of? call after r11508 (#13301).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11605 e93f8b46-1217-0410-a6f0-8f06a7374b81
Don't verify method.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11607 e93f8b46-1217-0410-a6f0-8f06a7374b81