This has been a problem with Element Web, as it will proble /register
with an empty body, which gave this error:
```
curl -d '{}' -HContent-Type:application/json /_matrix/client/v3/register
{"errcode": "M_UNKNOWN",
"error": "Invalid username"}
```
And Element Web would choke on it. This changes that so we reply
instead:
```
{"errcode": "M_FORBIDDEN",
"error": "Registration has been disabled. Only m.login.application_service registrations are allowed."}
```
Also adds a test for this.
See https://github.com/element-hq/element-web/issues/27993
---------
Co-authored-by: Andrew Morgan <andrew@amorgan.xyz>
