TRUNK-4436: Drug orders for different formulations of the same concept

This is a fix for https://issues.openmrs.org/browse/TRUNK-4436
I believe you have lines 420, 424 just to ensure that the concepts match, why not just get rid of them and on line 429 just assign the same concept from the existingOrder as below, you will be sure it is the same concept

order.setConcept(existingOrder.getConcept);