Exclude archived logs from log listing

Logrotate saves old log file with gunzip per EPEL squidGuard pkg
default. It's better to prevent binary files from being clicked upon.
Revert "Exclude archived logs from log listing"

This reverts commit 9441e35abdc164cae09034da1b8c93569d5b1b00.
Exclude archived logs from listing - modified

Admins might want to at least know their existence. Removing its link
will suffice.
Merge pull request #22 from Tatsuya-Nonogaki/master

Exclude archived logs from listing - modified