Fixes https://github.com/zed-industries/zed/issues/48457

Hidden files (like .config, .ssh, etc.) were not showing in the Open
Folder dialog when browsing remote servers via SSH. This was because the
`OpenPathDelegate` was not configured to show hidden files.

This fix adds .show_hidden() when creating the delegate for remote
project picker.


Release Notes:

- Fixed the hidden files not showing in remote project's open folder
action