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

git-svn-id: http://svn.redmine.org/redmine/trunk@12509 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/functional/issue_categories_controller_test.rb

@@ -66,7 +66,7 @@ class IssueCategoriesControllerTest < ActionController::TestCase
     assert_difference 'IssueCategory.count' do
       xhr :post, :create, :project_id => '1', :issue_category => {:name => 'New category'}
     end
-    category = IssueCategory.first(:order => 'id DESC')
+    category = IssueCategory.order('id DESC').first
     assert_equal 'New category', category.name
 
     assert_response :success