Rails4: replace deprecated Relation#last with finder options at IssuesControllerTest

git-svn-id: http://svn.redmine.org/redmine/trunk@12582 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rails4: replace deprecated find_all_by_* at WorkflowsController#copy

git-svn-id: http://svn.redmine.org/redmine/trunk@12583 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rails4: replace deprecated Relation#first with finder options at IssueRelationsControllerTest

git-svn-id: http://svn.redmine.org/redmine/trunk@12584 e93f8b46-1217-0410-a6f0-8f06a7374b81