Rails4: replace deprecated Relation#first with finder options at IssueCategoryTest

git-svn-id: http://svn.redmine.org/redmine/trunk@12525 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rails4: replace deprecated Relation#update_all at acts_as_list

git-svn-id: http://svn.redmine.org/redmine/trunk@12526 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rails4: replace deprecated Relation#update_all at IssueTest

git-svn-id: http://svn.redmine.org/redmine/trunk@12527 e93f8b46-1217-0410-a6f0-8f06a7374b81