tokio-xmpp: save bound_jid and features in ClientWorker

This fixes a regression from 10f1b3663c
reported by @full-bars in a discussion on an unrelated issue [1].

skip-changelog, because the regression has not been released yet.

   [1]: https://gitlab.com/xmpp-rs/xmpp-rs/-/merge_requests/675#note_3445588227

tokio-xmpp/src/client/worker.rs

@@ -81,6 +81,8 @@ impl ClientWorker {
                 bound_jid,
                 features,
             }) => {
+                self.bound_jid = Some(bound_jid.clone());
+                self.features = Some(features.clone());
                 self.iq_response_tracker
                     .set_account_jid(bound_jid.to_bare());