windows/certificates: Do not filter out system accounts
windows/certificates: Do not filter out system accounts

When proactively searching disk for personal certificates, there is no
need to filter system accounts (SYSTEM, Local Service, etc) anymore
because `findUserPersonalCertsOnDisk` is now capable of handling those
accounts by dynamically finding a user's home dir (as rather than
constructing a hard coded path).

This now makes the table even more complete; any certificates found in
the system accounts directories will always be found. Previously they
could be found but only if there was a store location other than the
`Users` store location that had a system store string that looked like
`S-1-5-18\My` or `.DEFAULT\My`.

hackgnar/osquery,hackgnar/osquery,hackgnar/osquery