Don't consider roles without issue add/edit permissions for determining fields permissions (#15988).

git-svn-id: http://svn.redmine.org/redmine/trunk@13747 e93f8b46-1217-0410-a6f0-8f06a7374b81
Don't show roles without issue add/edit permission in workflow setup (#15988).

git-svn-id: http://svn.redmine.org/redmine/trunk@13748 e93f8b46-1217-0410-a6f0-8f06a7374b81