bad error log for nextExpectedEvent
In `TestRunSwapDaemon_SwapBobHasNoEth_AliceRelaysClaim` (and some others doing successful swaps) we see this error log:
```
ERROR	xmrtaker	xmrtaker/watcher.go:23	failed to handle ready logs: nextExpectedEvent was EventNoneType, not EventETHClaimedType
```
Given that the test succeeds, we shouldn't have any logs at the error level.