Revert "[guix] disable BIP70 for the guix build"
Summary:
This reverts commit rABCa07b9766215b70ed03ecb8b983b99777cbff6fca.
The underlying issue has been fixed by D15440 and D15441.
Test Plan: Run the GUIX build.
Reviewers: #bitcoin_abc, PiRK
Reviewed By: #bitcoin_abc, PiRK
Differential Revision: https://reviews.bitcoinabc.org/D15445