Auto delete ListJobs

Commit 8c21ca3a broke the preview/opening of files. This is actually due to
ListJobs not autodeleting themeselves upon completion. This was introduced by
commit 4b67603d to fix bug 217836, which doesn't seem reproducible nowadays.

Even if it was, we would need a better fix, because this line is causing also
different issues on master (where we now run CliInterface from the main
thread).

CCBUG: 217836

Task: T2374