Revert "debian: Depend on libhandy >= 0.0.4"
We shouldn't hardcode this. Libhandy rather needs to ship a proper shlibs file:
https://source.puri.sm/Librem5/libhandy/merge_requests/142/diffs?commit_id=d939b98dbaa26a1215c0f8df64ae76b4366ace8f
This reverts commit 4c86efbe.