p2p: Fix "Unknown Channel" bug on CustomReactors (#6297)

CHANGELOG_PENDING.md

@@ -28,3 +28,4 @@ Friendly reminder, we have a [bug bounty program](https://hackerone.com/tendermi
 ### BUG FIXES
 
 - [rpc/jsonrpc/server] \#6191 Correctly unmarshal `RPCRequest` when data is `null` (@melekes)
+- [p2p] \#6289 Fix "unknown channels" bug on CustomReactors (@gchaincl)

p2p/peer.go

@@ -130,10 +130,15 @@ func newPeer(
 	onPeerError func(Peer, interface{}),
 	options ...PeerOption,
 ) *peer {
+	var channs = make([]byte, 0, len(chDescs))
+	for _, desc := range chDescs {
+		channs = append(channs, desc.ID)
+	}
+
 	p := &peer{
 		peerConn:      pc,
 		nodeInfo:      nodeInfo,
-		channels:      nodeInfo.(DefaultNodeInfo).Channels, // TODO
+		channels:      channs,
 		Data:          cmap.NewCMap(),
 		metricsTicker: time.NewTicker(metricsTickerDuration),
 		metrics:       NopMetrics(),