Fix blocked audio recording preview when Talk is embedded in the sidebar
Fix blocked audio recording preview when Talk is embedded in the sidebar

Audio recording previews use a blob, so the Content Security Policy must
allow media from blobs to be able to play it.

Signed-off-by: Daniel Calviño Sánchez <bd7629e975cc0e00ea7cda4ab6a120f2ee42ac1b@gmail.com>

nextcloud/spreed,nextcloud/spreed,nextcloud/spreed