Do not flag www redirection in redirection check

[Yuki2718]

Related issues
#27
#16
In checking the removed rules which are actually still useful, I noticed many of them have www redirect i.e. redirect to www.(the accessed domain) when accessed without www. This is a special case and should not be flagged in the check as with the case of #16.

An example is fxstreet.it removed by AdguardTeam/AdguardFilters@f2ae31e#diff-d1dd04144f2bef00096914d94854149276775e06d422b144faea333f69bfb0de Somehow only .it is low-traffic, hence probably not in the DNS data, but anyway the site is living and the rule is still active.

[Yuki2718]

It turned out the currrent DDL actually doesn't have redirection check, but I keep this opened as #27 may be fixed in future.