Updates to spatial joint FAR of same external event should update superevent

Considering comparisons to the exact same external event, our current system will only update the joint FAR numbers in the superevent if the joint FAR numbers are better. This causes issues if a PE sky map has less agree with the external sky map, since this won't cause an update.

The solution is to add a condition that if we are dealing with the same external event and a spatial FAR is present, then we automatically prefer the newer event (regardless if the joint FAR is improved).