htlcswitch tests: add missing OnChannelFailure to test link configs

htlcswitch/link_test.go

@@ -1489,7 +1489,8 @@ func newSingleLinkTestHarness(chanAmt, chanReserve btcutil.Amount) (
 		},
 		FetchLastChannelUpdate: mockGetChanUpdateMessage,
 		PreimageCache:          pCache,
-		OnChannelFailure: func(lnwire.ChannelID, lnwire.ShortChannelID, LinkFailureError) {
+		OnChannelFailure: func(lnwire.ChannelID,
+			lnwire.ShortChannelID, LinkFailureError) {
 		},
 		UpdateContractSignals: func(*contractcourt.ContractSignals) error {
 			return nil
@@ -3879,6 +3880,9 @@ func restartLink(aliceChannel *lnwallet.LightningChannel, aliceSwitch *Switch,
 		},
 		FetchLastChannelUpdate: mockGetChanUpdateMessage,
 		PreimageCache:          pCache,
+		OnChannelFailure: func(lnwire.ChannelID,
+			lnwire.ShortChannelID, LinkFailureError) {
+		},
 		UpdateContractSignals: func(*contractcourt.ContractSignals) error {
 			return nil
 		},