Revert "kio_trash: fix the logic when no size limit is set"
This reverts commit c6f0c8b8
As discussed in https://bugs.kde.org/show_bug.cgi?id=429102 the trash size is not related to the free disk size, as trashing files (usually) does not occupy more disk space.
Thus I propose to revert the fix.
I did not test this, just hit revert on the commit with the fix.