Save the "count unread messages" query, when the last read is the last room messages
Save the "count unread messages" query, when the last read is the last room messages

Signed-off-by: Joas Schilling <ab43a7c9cb5b2380afc4ddf8b3e2583169b39a02@schilljs.com>

nextcloud/spreed,nextcloud/spreed,nextcloud/spreed