Needs a source view.

Fixes:
```
ActionView::MissingTemplate at /admin/orders/R581540236/payments/6
Missing partial spree/admin/payments/source_views/adyen_encrypted with {:locale=>[:en], :formats=>[:html], :handlers=>[:erb, :builder, :raw, :ruby, :coffee, :rabl], :versions=>[:v1]}. Searched in:
  * "/Users/francisco/workspace/sdome/app/views"
  * "/Users/francisco/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/bundler/gems/spree_vouchers-b34340720eca/app/views"
```