minor improvement for Devise 'delete user' test for RSpec 3.0

Author: DanielKehoe

spec/features/users/user_delete_spec.rb

@@ -5,7 +5,7 @@
 #   As a user
 #   I want to delete my user profile
 #   So I can close my account
-feature 'User delete', :devise, js: true do
+feature 'User delete', :devise, :js do
 
   after(:each) do
     Warden.test_reset!