chanbackup: make sure onion addresses are covered in tests

chanbackup/backup_test.go

@@ -156,6 +156,7 @@ func TestFetchStaticChanBackups(t *testing.T) {
 	chanSource.chans[randomChan2.FundingOutpoint] = randomChan2
 	chanSource.addAddrsForNode(randomChan1.IdentityPub, []net.Addr{addr1})
 	chanSource.addAddrsForNode(randomChan2.IdentityPub, []net.Addr{addr2})
+	chanSource.addAddrsForNode(randomChan2.IdentityPub, []net.Addr{addr3})
 
 	// With the channel source populated, we'll now attempt to create a set
 	// of backups for all the channels. This should succeed, as all items