Fix the options on the notification pull point query

[pmanko]

openmrs-module-xds-sender/api/src/main/java/org/openmrs/module/xdssender/api/notificationspullpoint/impl/NotificationsPullPointClientImpl.java

Line 157 in a0137c4

String getMessagesPayload = String.format(""

We need to be able to query only the messages that were created since the last time we sent the query.

We should then make sure that we have a fail-safe on the OpenMRS side for when messages fail to save, so we don't end up querying and processing the same set of messages, but don't lose any either.