This reverts commit 71056982636b408485ab24dab6628a555a6e7924, reversing changes made to 03c37bd378f4f6bf11d90b224ed1db74b3596eaf. This reverts PR #722. It turns out the Ledger Bitcoin app needs the BIP32 derivation for all the keys in the Script, not only for the spending path used. Therefore always create PSBT with all the BIP32 derivations. We'll add a way to prune them for talking to the Bitbox in a future commit.