fix: duplicated swept vtxos in sweep tx event

[Dunsin-cyber]

fixes #1138 WIP

The fix

before the event is created, the sweeper filters the first list's coins out of the second one, so the two lists never overlap. This also keeps the event stored on disk clean, not just the message sent to clients

TODO

• vet and tidy up the fix
• add regression test and possibly test with go-sdk

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