Invalid quota response (WebDAV)

## Describe the bug
The quota reporting for spaces is bogus.

## Steps to reproduce

```
PROPFIND /remote.php/webdav/Shares/ HTTP/1.1
Depth: 0
Content-Type: text/xml; charset=utf-8
Content-Length: 145
Host: ocis.ocis-keycloak.latest.owncloud.works
Connection: Keep-Alive
User-Agent: Cyberduck/8.8.3.41356 (Mac OS X/14.4.1) (aarch64)
Accept-Encoding: gzip,deflate
Authorization: …

HTTP/1.1 207 Multi-Status
Access-Control-Expose-Headers: Tus-Resumable, Tus-Version, Tus-Extension
Content-Length: 354
Content-Security-Policy: default-src 'none';
Content-Type: application/xml; charset=utf-8
Date: Fri, 12 Apr 2024 09:13:26 GMT
Dav: 1, 3, extended-mkcol
Tus-Extension: creation, creation-with-upload, checksum, expiration
Tus-Resumable: 1.0.0
Tus-Version: 1.0.0
Vary: Origin, Prefer
X-Content-Type-Options: nosniff
X-Download-Options: noopen
X-Frame-Options: SAMEORIGIN
X-Permitted-Cross-Domain-Policies: none
X-Request-Id: 5929683efe9a/3PIGz8pAn4-000124
X-Robots-Tag: none
X-Xss-Protection: 1; mode=block

/remote.php/webdav/Shares/


-2
0

HTTP/1.1 200 OK

```