Show the booked slot if visit has been approved
Show the booked slot if visit has been approved

This was defaulting to the first slot requested even after the visit had
been accepted.  This logic show the booked slot if the visit is
accepted, and the first requested slot if it is not.

ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-2