50-alsa-config.lua: Add missing commas

Be consistent with all other files and add commas at the end of sections.
6 jobs for config-add-missing-comma in 2 minutes and 20 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Container
passed container_fedora #13546886

00:01:00

passed container_ubuntu #13546887

00:00:56

 
  Build
passed build_on_fedora_no_docs #13546889

00:01:10

passed build_on_fedora_with_docs #13546888

00:01:19

passed build_on_ubuntu_no_gir #13546891

00:01:09

passed build_on_ubuntu_with_gir #13546890

00:01:10