recipient pubkey is not set when loading in an encrypted DM from_event()

[Dustin Dannenhauer]

If I want to create an encrypted DM object from a kind 4 event, the recipient key isn't set anywhere automatically in the encrypted_dm.py file.

Perhaps adding the following to the from_event() method is a solution?

try:  # could avoid this with a few checks, this is a lazy solution
  if event_msg.event.tags[0][0] == 'p':
      dm.recipient_pubkey = event_msg.event.tags[0][1]
except:
  pass

to

@classmethod
def from_event(cls, event: Event) -> 'EncryptedDirectMessage':
    if event.kind != EventKind.ENCRYPTED_DIRECT_MESSAGE:
        return None
    dm = EncryptedDirectMessage(encrypted_message=event.content)
    dm.pubkey = event.pubkey
    dm.event = event

    # added code here
    try:  # could avoid this with a few checks, this is a lazy solution
      if event_msg.event.tags[0][0] == 'p':
          dm.recipient_pubkey = event_msg.event.tags[0][1]
    except:
      pass

    return dm