Added release covers table to flush routine.

src/media.js

@@ -757,6 +757,7 @@ async function flushOrphanedMedia() {
 							knex('tags_photos').select('media_id'),
 							knex('releases_posters').select('media_id'),
 							knex('releases_photos').select('media_id'),
+							knex('releases_covers').select('media_id'),
 							knex('releases_trailers').select('media_id'),
 							knex('releases_teasers').select('media_id'),
 							knex('movies_covers').select('media_id'),