OCR; When checking if a service is available and configured, the wrong license setting was checked

When using the OCR's "IsServiceAvailableAndConfigured" function, the "Electronic Signature" license was checked instead of the "OCR" license.

NOTE: The OCR licence option is used internally within finPOWER Connect and currently always returns True (finBL.Settings.AddOns.Ocr) meaning that there is no need to licence this option.