When we migrated `UrlBlocker` to `HTTP_V2::UrlBlocker`, we changed
how the `deny_all_requests_except_allowed` parameter is passed to
the `HTTP_V2::UrlBlocker` class from `AddressableUrlValidator`.

The proc parameter must be correctly passed to the UrlBlocker
that is initialized in
!111510.

Bug was introduced in
!141349.

Changelog: fixed