Set bind path for DirectorySearcher explicitly (fixes PTT)

[snovvcrash]

A simple fix for the DirectorySearcher to work with PTT in this PR.

When operating from a sacrificial process with a TGT injected, DirectorySearcher fails to enumerate current domain root, but if the domain name is specified, we can pass it to the DirectoryEntry constructer which results in a successful bind.

@TheWover's PR #6 also solves this, btw.