firewallog.dat: Fix bug13068 - remove blocklist entries from firewall log

firewallog.dat: Fix bug13068 - remove blocklist entries from firewall log

- The blocklist log entries are also under kernel: and so currently also show up in the
   firewall logs as well as in the ip blocklist logs menus. If there are a lot of
   blocklist entries it can make it very difficult to go through the firewall logs.
- This bugfix excxludes any kernel: log entries that have a chain starting with BLKLST.
- Tested out on physical and vm IPFire systems.

Fixes: bug13068
Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>