fix: Keep webxdc instance for delete_device_after period after a status update (#5365)

If `delete_device_after` is configured, that period should be counted for webxdc instances from the
last status update, otherwise nothing prevents from deleting them. Use `msgs.timestamp_rcvd` to
store the last status update timestamp, it anyway isn't used for anything except displaying a
detailed message info. Also, as `ephemeral::select_expired_messages()` now also checks
`timestamp_rcvd`, we have an improvement that a message is guaranteed not to be deleted for the
`delete_device_after` period since its receipt. Before only the sort timestamp was checked which is
derived from the "sent" timestamp.

src/debug_logging.rs

@@ -64,6 +64,7 @@ pub async fn debug_logging_loop(context: &Context, events: Receiver<DebugEventLo
                     document: None,
                     uid: None,
                 },
+                time,
             )
             .await
         {