fix(keymap): backport use of correct `derivation_path` for keys with origin#867

oleonardolima wants to merge 2 commits intorust-bitcoin:release-12.xrust-bitcoin/rust-miniscript:release-12.xfrom

oleonardolima:backport-863-to-12.xoleonardolima/rust-miniscript:backport-863-to-12.xCopy head branch name to clipboard