fix: emit 'listening' when relays change #3561

Job	Run time
Build	3m 16s
Test example js-libp2p-example-browser-pubsub	2m 5s
Test example js-libp2p-example-chat	1m 2s
Test example js-libp2p-example-circuit-relay	1m 21s
Test example js-libp2p-example-connection-encryption	1m 9s
Test example js-libp2p-example-custom-protocols	1m 13s
Test example js-libp2p-example-delegated-routing	2m 23s
Test example js-libp2p-example-discovery-mechanisms	1m 26s
Test example js-libp2p-example-peer-and-content-routing	1m 37s
Test example js-libp2p-example-pnet	1m 26s
Test example js-libp2p-example-protocol-and-stream-muxing	1m 22s
Test example js-libp2p-example-pubsub	1m 10s
Test example js-libp2p-example-transports	1m 23s
Test example js-libp2p-example-webrtc-private-to-private	2m 16s
	23m 9s

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