macosx: Fix path control in browse view

Fixes #28647 (closed)

@ePirat @fkuehne is this an acceptable solution? We cannot rely in NSImage's name property as this seems to break on successive entries into the same input node, and though we use accessibilityDescription here I think this is a way to do it without affecting accessibility (too much)

Signed-off-by: Claudio Cambra developer@claudiocambra.com