OAuth 2 services is displayed always when creating a badge backpack regardless the OB version

Steps to reproduce:

1. Login as admin.
2. Go to "Site administration / Badges / Manage backpacks".
3. Click the "Add a new backpack" button.
4. Set "API version supported" to Open Badges v2.0.

Expected result:

The "OAuth 2 services" field should be hidden and the password should be displayed.

Current result:

The "OAuth 2 services" field is still displayed and the password field is not shown. When saving changes and editing it again, the form is displayed as expected.

It happens the same when selecting "Open Badges v1.0". In that case, the expected result is to hide both, password and oAuth 2 services fields.