payjoin / rust-payjoin / 15861266504

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Move `extract_fallback_tx` to `MaybeInputsOwned` (#801)

Per BIP-77:

> At any point, either party may choose to broadcast the fallback
> transaction described by the Original PSBT instead of proceeding.

However, the fallback transaction available at the `UncheckedProposal`
typestate may not be "broadcastable". Only after transitioning to
`MaybeInputsOwned` via `check_broadcast_suitability` can we determine
with high confidence that the fallback is valid for broadcast.

Related PR: [#799](https://github.com/payjoin/rust-payjoin/pull/799)

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