Fixed js for proper error field focusing.

Preparations

In the core\units\users\users_event_handler.php replace line

`$form_fields['Status']['default'] = STATUS_ACTIVE;

with:

$form_fields['Status']['default'] = null;
$form_fields['Status']['required'] = 1;

Testing

1. Go to User Management & Users section
2. Press Add toolbar button
3. Enter required Password, Re-enter Password and E-mail fields
4. Press Save toolbar button
5. Confirm that form shows error and is scrolled to the Status field
6. Choose some value for Status field
7. Input abc in the Modified date field
8. Press Save toolbar button
9. Confirm that form shows error and is scrolled to the Modified field