audiotestsrc: Make audiotestsrc work

This small patch makes audiotestsrc work.

You will need to uncomment the following lines in pipewire.conf

add-spa-lib audiotestsrc audiotestsrc/libspa-audiotestsrc
create-object adapter node.name=my-test factory.name=audiotestsrc

If you use pw-record, use --list-targets to find the target id and record using --target=

Signed-off-by: Pantelis Antoniou pantelis.antoniou@konsulko.com