Unmount final-form when modal is closed
Unmount final-form when modal is closed

Otherwise we get inconsistent state when uploading a file (without
saving) and then closing and reopening the modal.

pferreir/indico,ThiefMaster/indico,indico/indico,indico/indico,DirkHoffmann/indico,DirkHoffmann/indico,indico/indico,indico/indico,pferreir/indico,DirkHoffmann/indico,ThiefMaster/indico,pferreir/indico,DirkHoffmann/indico,pferreir/indico,ThiefMaster/indico,ThiefMaster/indico