blockchain: fix random sync failures

When a block is added as part of a chunk (when syncing historical
blocks), a block may end up already in the blockchain if it was
added to the queue before being added to the chain (though it's
not clear how that could happen, but it's an implementation detail)
and thus may not be added to the chain when add_block is called.
This would cause m_blocks_txs_check to not be cleared, causing it
to get out of sync at next call, and thus wrongfully reject the
next block.

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