stdapi/sys/registry calls send_packet instead of send_request

[Meatballs1]

The Registry.close_key calls client.send_packet(request) instead of client.send_request(request).

This appears to be incorrect as only a very few places call send_packet directly...

@bcook-r7 @OJ is this at all related to the hanging handles you were seeing with registry in meterpreter?

[Meatballs1]

The other places that do a close (e.g. process/thread/channel) do a send_request(request, nil) at least. There's not much practical difference at present but I think both are causing problems at present.

[Meatballs1]

#5851

[bcook-r7]

Fixed a while back.