Re-include RBF replacement txs in fee estimation
Re-include RBF replacement txs in fee estimation

This effectively reverts de1ae324bf3fb7451c1008a1a9721ff9f469533b.

RBF is now largely in use on the network (signaled for by around 20% of
all transactions on average) and replacement logic is implemented in
most end-user wallets. The rate of replaced transactions is also
expected to rise as fee-bumping techniques are being developed for
pre-signed transaction ("L2") protocols.

Signed-off-by: Antoine Poinsot <0fdf30a351670cde318d282b5fede3c3548275bc@protonmail.com>

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