vaultwarden: Change Domain URL

The rule is "if it is accessible on the Internet, its name ends in .net"

Although Vaultwarden can be accessed by either name, the one specified
in the Domain URL setting is the only one that works for WebAuthn.

group_vars/bitwarden_rs.yml

@@ -1,4 +1,4 @@
-bitwarden_domain: https://bitwarden.pyrocufflink.blue
+bitwarden_domain: https://bitwarden.pyrocufflink.net
 burp_backup_script_pre: /etc/burp/backup-pre.sh
 burp_backup:
 - include: /var/lib/vaultwarden/data