guardian_form_user_form_alter() does not apply when editing user 1 as another user

Problem/Motivation

Guardian has code in guardian_form_user_form_alter() to prevent the login details of a guarded from being edited. However, this code only applies when the form is opened by the current user (user 1).

Proposed resolution

Correct guardian_form_user_form_alter() so it applies correctly on the user edit form for a guarded account.

Remaining tasks

1. Write a patch
2. Review
3. Commit

User interface changes

The username, email address and password can no longer be edited in a guarded user account.

API changes

None.

Data model changes

None.