remove unneeded Relation#all from WorkflowsController#edit

git-svn-id: http://svn.redmine.org/redmine/trunk@12999 e93f8b46-1217-0410-a6f0-8f06a7374b81
remove unneeded Relation#all from Issue#workflow_rule_by_attribute

git-svn-id: http://svn.redmine.org/redmine/trunk@13000 e93f8b46-1217-0410-a6f0-8f06a7374b81