Remove code comment about Add a global property that enables different behavior here

Issues from TODOs

Line 170 of ADTA28Handler.java
Link: https://github.com/openmrs/openmrs-core/blob/df148feaddd762ffe7394eabfbdc491eed5e28d0/api/src/main/java/org/openmrs/hl7/handler/ADTA28Handler.java#L170

Contains the TODO
Add a global property that enables different behavior here
log.info("Ignoring ADT_A28 message because patient (" + patientId + ") already exists.");