Auzwow breaks site without captcha enabled

[bonny1992]

If you don't have captchas enabled, enabling Auzwow will break the login and admin page, returning 404 (but really it's a failed call to getCaptcha).

[bonny1992]

Errata corrige:
It breaks login with every captcha settings (true/false or recaptcha/recaptcha3/inbuilt), rendering impossible to also get to the admin panel to change the theme back.
We have to edit fusion.php to revert back to default theme.