Fix RBF nsequence: canonical value, all inputs#21
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0x01 signals opt-in RBF, but on v2 txs it also sets a BIP-68 relative timelock of 1 block (unintended), and it's an abnormal value that fingerprints the wallet on-chain, harmful in collaborative settings like payjoin. It was also applied only to inputs[0], leaving a mixed [0x01, MAX, …] pattern that fingerprints too.
use the canonical 0xFFFFFFFD (ENABLE_RBF_NO_LOCKTIME) and apply it to every input, in both builders.
ref: payjoin/rust-payjoin#1597
closes #22