bitwarden_rs: Update burp backup path

Vaultwarden data are stored in a different location since the migration
to Podman.

group_vars/bitwarden_rs.yml

@@ -1,7 +1,7 @@
 bitwarden_domain: https://bitwarden.pyrocufflink.blue
 burp_backup_script_pre: /etc/burp/backup-pre.sh
 burp_backup:
-- include: /var/lib/docker/volumes/bw-data/_data
+- include: /var/lib/vaultwarden/data
 
 collectd_processes:
 - name: vaultwarden