Rails4: replace deprecated Relation#update_all at GroupTest

git-svn-id: http://svn.redmine.org/redmine/trunk@12530 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rails4: replace deprecated Relation#update_all at IssueCategory model

git-svn-id: http://svn.redmine.org/redmine/trunk@12531 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rails4: replace deprecated Relation#update_all at Issue model

git-svn-id: http://svn.redmine.org/redmine/trunk@12532 e93f8b46-1217-0410-a6f0-8f06a7374b81