scanlogs: remove special handling of expire.log

[Julien ÉLIE]

Hi Florian,

> in the course of looking at the OLD/expire.log.0 bug, I wondered why
> expire.log would need to be handled specially at all. Turns out there is
> no need, and expire.log is rotated just the same without special
> mention (see patch below).

Thanks, just committed.

-- 
Julien ÉLIE

« -- C'est une bonne situation ça, scribe ?
  -- Oh, c'est une situation assise. » (Astérix)