send PUT requests to another user's webDav endpoints as normal user [edge]

[phil-davis]

Describe the bug

Sending a PUT request to another users' WebDav endpoints as a normal user gives status code 409 rather than 403

Steps to reproduce

Steps to reproduce the behavior:

See the description in #2759

Expected behavior

In cs3org/reva master and owncloud/ocis master the behavior is correct. 403 is returned all the time.

Actual behavior

But in cs3org/reva edge it is returning 409 - there seems to be some difference that happened in edge

Setup

Current CI in cs3org/reva edge

Note: in oC10 it returns 403 when trying to access the root folder of a user, and 409 when trying to access something inside a sub-folder. That is a different oC10 core issue owncloud/core#39597