[Bugfix] Fixing AbuseIP DB update script to only include valid IPs

[spaaleks]

The used IP DB list now contains per line comments which breaks the Caddy configuration.

E.g.:

1.0.87.120       # JP  AS18144   Enecom,Inc.
1.0.211.179      # TH  AS23969   TOT Public Company Limited
1.0.211.200      # TH  AS23969   TOT Public Company Limited
1.2.188.61       # TH  AS23969   TOT Public Company Limited

results in

remote_ip 1.0.87.120
remote_ip #
remote_ip JP
remote_ip AS18144
remote_ip Enecom,Inc.
remote_ip 1.0.211.179
remote_ip #
remote_ip TH
remote_ip AS23969
remote_ip TOT
remote_ip Public
remote_ip Company
remote_ip Limited
remote_ip 1.0.211.200
[...]

This MR fixes the issue by doing a simple regex check on 4 times 3 numbers separated by a dot.