p2p: channel shim cleanup (#7129)

internal/blocksync/reactor.go

@@ -30,7 +30,7 @@ var (
 	ChannelShims = map[p2p.ChannelID]*p2p.ChannelDescriptorShim{
 		BlockSyncChannel: {
 			Descriptor: &p2p.ChannelDescriptor{
-				ID:                  byte(BlockSyncChannel),
+				ID:                  BlockSyncChannel,
 				MessageType:         new(bcproto.Message),
 				Priority:            5,
 				SendQueueCapacity:   1000,

internal/blocksync/reactor_test.go

@@ -65,7 +65,7 @@ func setup(
 		blockSync:         true,
 	}
 
-	chDesc := p2p.ChannelDescriptor{ID: byte(BlockSyncChannel)}
+	chDesc := p2p.ChannelDescriptor{ID: BlockSyncChannel}
 	rts.blockSyncChannels = rts.network.MakeChannelsNoCleanup(t, chDesc, new(bcproto.Message), int(chBuf))
 
 	i := 0