Method approve() is overridden to accommodate new users that will have their verification approved in the future.
The approve() method is called from software secure results callback every time a Software Secure Photo Verification
is approved.The method overridden now updates expiry_date and then calls super to perform task it was performing
before this change.The expiry_date set is the same as the one sent in verification approval email.
In results_callback for sspv the expiry_date and expiry_email_date for the most recent previous verification if exists
are also updated to NULL.
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