payjoin / rust-payjoin / 16605192943

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Remove unneeded PSBT fields when extracting request (#907)

`PsbtContextBuilder` stores a Psbt with [unneeded fields
removed](https://github.com/payjoin/rust-payjoin/blob/<a class=hub.com/payjoin/rust-payjoin/commit/57ec41b1ebfd325ded9fc216096ec3930ed40b4b">57ec41b1e/payjoin/src/core/send/mod.rs#L524).
Our API later attempts to restore _some_ of these fields after we
process the response from the receiver.

https://github.com/payjoin/rust-payjoin/blob/57ec41b1ebfd325ded9fc216096ec3930ed40b4b/payjoin/src/core/send/mod.rs#L411

However, since the original psbt was already stripped of "unneeded"
fields there is nothing to restore. This commit removes the extranous
PSBT fields when we are extracting the POST request but leaves the
fields in the `original_psbt` untouched.

Related ticket: #906

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