Actually log MUC PM messages

If I'm not mistaken MUC PMs have not been logged at all if there was no
other client sending carbons.
This should add MUC PM logging functionality.

We still need to make sure carbons log to the same file.

Regards https://github.com/profanity-im/profanity/issues/1214

src/event/server_events.c

@@ -398,6 +398,7 @@ sv_ev_incoming_private_message(ProfMessage *message)
         privatewin = (ProfPrivateWin*)window;
     }
     privwin_incoming_msg(privatewin, message);
+    chat_log_msg_in(message);
 
     plugins_post_priv_message_display(message->jid->fulljid, message->plain);
 
@@ -436,7 +437,7 @@ sv_ev_outgoing_carbon(ProfMessage *message)
     chat_state_active(chatwin->state);
 
     if (message->plain) {
-        chat_log_msg_out(message->jid->barejid, message->plain);
+        chat_log_msg_out(message->jid->barejid, message->plain, NULL);
     }
 
 #ifdef HAVE_LIBGPGME