This function deletes schedule by id.
Doesn't return any data.
jetapi backup -F deleteSchedule -D '_id=5b697f04d5ac5e665e77c982'
https://hostname.example.com:2087/cpsess##########/cgi/addons/jetbackup/api.cgi?function=deleteSchedule&_id=5b697f04d5ac5e665e77c982