Mark registration profile activated when confirming invited user

[jwalgran]

Overview

The registration system uses both the activated field in addition to the User.is_active fields. Setting User.is_active to false after activation lets us disable an account and prevent the user from reactivating it. Because of this we must also update the activated field.

Connects #3247

Notes

Before this fix, users who accepted invitations were unable to reset their passwords because of this code:

https://github.com/OpenTreeMap/otm-core/blob/2.21.0/opentreemap/registration_backend/views.py#L211-L212

Testing Instructions

• Run ./scripts/debugserver.sh
• Browse http://localhost:6060/create and make an instance named activation-test
• Browse http://localhost:6060/activation-test/management/user-roles/
• Click "Add User" and submit an email address that does not yet exist in the database.
• An invitation email will be logged to the console. Open the link included in that email in a different browser or incognito window.
• Fill out the registration form making sure to use the exact same email address associated with the invitation.
• Submit the registration form and verify that you are successfully logged in.
• Click logout, then browse http://localhost:6060/activation-test/. You should be prompted to log in.
• Click "Reset my Password"
• Submit the email address used to create the test user and verify that a password reset email is printed to the console.

[coveralls]

Coverage increased (+0.001%) to 83.868% when pulling ea2f9fe on jcw/fix-invitation-activation into 7ea8b1f on develop.

[mmcfarland]

Reset link was generated in the console.