This function deletes restore condition by id.
Doesn't return any data.
jetapi backup -F deleteRestoreCondition -D '_id=5b66bb09d5ac5e1c714985e2'
https://hostname.example.com:2087/cpsess##########/cgi/addons/jetbackup/api.cgi?function=deleteRestoreCondition&_id=5b66bb09d5ac5e1c714985e2