test: remove timeout from pop_sent_msg_ex()

Arbitrary timeouts often result in flaky tests,
especially if CI runners may be paused.
In this case however timeout was not used by any tests
and only slowed down the tests in cases where
no message is expected but non-zero timeout is set.

src/securejoin/securejoin_tests.rs

@@ -950,7 +950,7 @@ async fn test_parallel_setup_contact(bob_deletes_fiona_contact: bool) -> Result<
         Contact::delete(bob, bob_fiona_contact_id).await?;
 
         bob.recv_msg_trash(&sent_fiona_vc_auth_required).await;
-        let sent = bob.pop_sent_msg_opt(Duration::ZERO).await;
+        let sent = bob.pop_sent_msg_opt().await;
         assert!(sent.is_none());
     } else {
         bob.recv_msg_trash(&sent_fiona_vc_auth_required).await;
@@ -1235,7 +1235,7 @@ async fn test_rejoin_group() -> Result<()> {
     assert_eq!(progress, 1000);
 
     // Bob does not send any more messages by scanning the QR code.
-    assert!(bob.pop_sent_msg_opt(Duration::ZERO).await.is_none());
+    assert!(bob.pop_sent_msg_opt().await.is_none());
 
     Ok(())
 }