shorten long line of CustomFieldsControllerTest

git-svn-id: http://svn.redmine.org/redmine/trunk@20117 e93f8b46-1217-0410-a6f0-8f06a7374b81

Author: marutosi

test/functional/custom_fields_controller_test.rb

@@ -417,7 +417,9 @@ def test_destroy
   end
 
   def custom_field_classes
-    files = Dir.glob(File.join(Rails.root, 'app/models/*_custom_field.rb')).map {|f| File.basename(f).sub(/\.rb$/, '') }
+    files =
+      Dir.glob(File.join(Rails.root, 'app/models/*_custom_field.rb')).
+        map {|f| File.basename(f).sub(/\.rb$/, '')}
     classes = files.map(&:classify).map(&:constantize)
     assert classes.size > 0
     classes