The moveToTrash tests, on XDG platforms, would be trashing to
~/.local/share/Trash. Unlike Windows and Apple systems, the XDG trash
spec creates two files and these tests weren't deleting both of them, so
we had a slow increase of left-over files in ~/.local/share/Trash/info.
Cleaning up ~/.qttest is left as an exercise for the users. For example,
$ cat ~/.config/user-tmpfiles.d/qttest.conf
#Type Path Mode User Group Age Argument
e %h/.qttest 0700 - - 1w
Pick-to: 6.6 6.5 6.2
Change-Id: I9d43e5b91eb142d6945cfffd1786aeff91d34fde
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
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