bluetooth: Release container with device UUID strings

Stop leaking container with UUID strings when releasing adapter.

Fixes: 4b55b8a9 ("bluetooth: Keep a list of local adapters' UUIDs")
Part-of: <pulseaudio/pulseaudio!652>
2 jobs for pr/release-adapter-uuids in 2 minutes and 50 seconds (queued for 11 seconds)