Fix the path shown for unrepresented files

To represent the bunch of smaller files, we add a fake File item
with a custom string as a file name.

Set the directory path too into that string. Otherwise, File adds
the current working directory as the path for our fake item,
showing the wrong information.

BUG: 461964
FIXED-IN: 22.12.0
6 jobs for !63 with work/iasensio/fix-unrepresented-path in 1 minute and 54 seconds (queued for 2 seconds)
merge request