Remove code comment about Eliminate unnecessary methods

Issues from TODOs
Line 33 of Result.java
Link: https://github.com/openmrs/openmrs-core/blob/df148feaddd762ffe7394eabfbdc491eed5e28d0/api/src/main/java/org/openmrs/logic/result/Result.java#L33

Eliminate unnecessary methods (toDatetime(), getDatetime(), and getDate() should all do the same thing)