community/wireplumber: Backport fix for camera deduplication

Which is necessary to make both inbuild cameras on the Pixel 3a and similar devices usabele.

While the patch has not landed yet, it has been successfully tested on all pmOS devices with multiple working cameras - as well as classic laptop/desktop setups.

See https://gitlab.freedesktop.org/pipewire/wireplumber/-/merge_requests/674