Add unconfirmed transaction pruning when computing closing balance #3119
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Our node balance computation was simplified in #3096, but it is now too simplistic during closing, where some of the balance may be duplicated between the off-chain part and unconfirmed or recently confirmed transactions.
We deduplicate those by not counting in our off-chain balance of closing channels outputs that are spent by an unconfirmed or recently confirmed transaction that we've included in our on-chain balance.
Fixes #3098