Function unregister

nodedb/src/event/cdc/registry.rs:265–271

()

    #[test]
    fn unregister() {
        let reg = StreamRegistry::new();
        reg.register(sample_def("s1", "orders"));
        assert!(reg.unregister(1, "s1"));
        assert!(!reg.unregister(1, "s1"));
        assert!(reg.is_empty());
    }
}