Pull request: all: rm inactive list, imp lint script

Updates #2644.

Squashed commit of the following:

commit 1a1c2f0a232885d8ea6335bce2831a5a21fe800a
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Jun 25 18:17:51 2021 +0300

    all: rm inactive list, imp lint script

internal/home/filter.go

@@ -59,7 +59,6 @@ func defaultFilters() []filter {
 	return []filter{
 		{Filter: filtering.Filter{ID: 1}, Enabled: true, URL: "https://adguardteam.github.io/AdGuardSDNSFilter/Filters/filter.txt", Name: "AdGuard DNS filter"},
 		{Filter: filtering.Filter{ID: 2}, Enabled: false, URL: "https://adaway.org/hosts.txt", Name: "AdAway Default Blocklist"},
-		{Filter: filtering.Filter{ID: 4}, Enabled: false, URL: "https://www.malwaredomainlist.com/hostslist/hosts.txt", Name: "MalwareDomainList.com Hosts List"},
 	}
 }