Default scope value is incorrect (empty) for Social Auth VKontakte module

Bug description

Cannot add Social Auth VKontakte module with the default values because scope is empty and it requires the scope to be setup. 

How to reproduce the issue

1. Login as admin and go to Authentication->Modules->New Module -> Social Auth VKontakte 
2. Fill in the client ID and secret and hit Save button

Expected behaviour

When the client ID and secret is entered should be able to create Social Auth VKontakte module with default values

Current behaviour

Cannot create Social Auth VKontakte with default values. Scope is missing