Event history contains duplicate objects

[raphdev]

We received reports of a few RPC nodes logging errors. It seems that we have duplicate entries in the event history, which occasionally cause problems.

Investigation revealed that we capture events in both runTx and deliverTx, albeit under differing circumstances. We should stop capturing events in runTx as we already do it in deliverTx, and ensure that all the circumstances we want to capture event are handled in deliverTx.