This function deletes restore file permission by id.
Doesn't return any data.
jetapi backup -F deleteFilePermission -D '_id=59f1db26f7ec181ba44138df'
https://hostname.example.com:2087/cpsess##########/cgi/addons/jetbackup/api.cgi?function=deleteFilePermission&_id=59f1db26f7ec181ba44138df