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Add DNS64 configuration to DNS Resolver WebGUI

from https://github.com/monero-project/unbound/blob/master/doc/README.DNS64:

To enable DNS64 functionality in Unbound, two directives in unbound.conf must
be edited:

1. The "module-config" directive must start with "dns64". For example:

    module-config: "dns64 validator iterator" 

2. The "dns64-prefix" directive indicates your DNS64 prefix. For example:

    dns64-prefix: 64:FF9B::/96

The prefix must be a /96 or shorter.