use with_settings instead of direct "Setting" at "test_index" of functional issues controller test

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@8885 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/functional/issues_controller_test.rb

@@ -55,8 +55,7 @@ class IssuesControllerTest < ActionController::TestCase
   end
 
   def test_index
-    Setting.default_language = 'en'
-
+    with_settings :default_language => "en" do
       get :index
       assert_response :success
       assert_template 'index'
@@ -70,6 +69,7 @@ class IssuesControllerTest < ActionController::TestCase
       # project column
       assert_tag :tag => 'th', :content => /Project/
     end
+  end
 
   def test_index_should_not_list_issues_when_module_disabled
     EnabledModule.delete_all("name = 'issue_tracking' AND project_id = 1")