Code review comment for lp:~widelands-dev/widelands/add-xdg-support

I had a look at the spec - we have a "temp" dir now for map backups that are used to make saveloading of games stable. If we want to be strict, those files should go to:

"There is a single base directory relative to which user-specific runtime files and other file objects should be placed. This directory is defined by the environment variable $XDG_RUNTIME_DIR."