Follow-up of !5824.

Accidently removed `decibels` in a MR revision:
https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/5824/diffs?diff_id=27482&start_sha=a5318d3eef5f6d08c08e086098a42af461f768fe

[ci:skip-vercheck]