Securejoin fails if the inviter (Alice) had a protected 1:1 chat before

[Hocuri]

This makes the CI in #4967 fail.

Minimal failing test:

/// Regression test for the following bug:
///
/// - Scan your chat partner's QR Code
/// - They change devices
/// - Scan their QR code again
///
/// -> The re-verification fails.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn test_verify_then_verify_again() -> Result<()> {
    let mut tcm = TestContextManager::new();
    let alice = tcm.alice().await;
    let bob = tcm.bob().await;
    enable_verified_oneonone_chats(&[&alice, &bob]).await;

    mark_as_verified(&alice, &bob).await;
    mark_as_verified(&bob, &alice).await;

    alice.create_chat(&bob).await;
    assert_verified(&alice, &bob, ProtectionStatus::Protected).await;

    tcm.section("Bob reinstalls DC");
    drop(bob);
    let bob_new = tcm.unconfigured().await;
    enable_verified_oneonone_chats(&[&bob_new]).await;
    bob_new.configure_addr("bob@example.net").await;
    e2ee::ensure_secret_key_exists(&bob_new).await?;

    tcm.execute_securejoin(&bob_new, &alice).await;
    assert_verified(&alice, &bob_new, ProtectionStatus::Protected).await;

    Ok(())
}