update.sh: Remove existing entries for ALIENVAULT & SPAMHAUS_EDROP

update.sh: Remove existing entries for ALIENVAULT & SPAMHAUS_EDROP

- This removes any time entries in the modified file for either ALIENVAULT or
   SPAMHAUS_EDROP.
- This also removes any blocklists for either of these sources from the /var/lib/ipblocklist
   directory.
- This patch will ensure that any reference to either of these sources is removed from the
   ipblocklist files.

Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>