Webdav folder fails test when only subfolder is writeable

[ricardoteixeiraduarte]

Say I have the following structure:

https://my.webdav.server/ (read-only)
https://my.webdav.server/subfolder (read-write)

I add https://my.webdav.server/subfolder as a syncany remote folder, but test fails because syncany tries to test write permissions under https://my.webdav.server

In this particular case, permissions for the root folder can't be changed as this is a Novell Filr (proprietary) webdav server.