Set the status of the form data.

This form provides an interface to set the status. The COMPLETED status will lock the form for further changes and is equivalent to completing the form in geoCapture. BOOKED is a status that is exclusively accessible through the API. When the status is set, an entry will be created in the custom form log with the content: "form booked". This can help distinguish between custom forms that have been exported and those that have not.