WebDAV delete doesn't work id-based

[JammingBen]

Describe the bug

Deleting a file via an id-based webdav request doesn't work.

Steps to reproduce

1. Create a resource
2. Delete that resource via a webdav DELETE request: https://localhost:9200/remote.php/dav/spaces/{fileId}

Expected behavior

The file is being deleted. According to #6526 (comment) this should work.

Actual behavior

The server responds with 405 Method Not Allowed.

[JammingBen]

Fixed via cs3org/reva#4771.