channeldb+lnwire: rename MsgFundingLocked to MsgChannelReady

This commit is created by running,

```shell
gofmt -d -w -r 'MsgFundingLocked -> MsgChannelReady' .

gco master channeldb/migration
```

lnwire/funding_locked.go

@@ -111,5 +111,5 @@ func (c *ChannelReady) Encode(w *bytes.Buffer, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *ChannelReady) MsgType() MessageType {
-	return MsgFundingLocked
+	return MsgChannelReady
 }

lnwire/fuzz_test.go

@@ -289,7 +289,7 @@ func FuzzFundingCreated(f *testing.F) {
 func FuzzFundingLocked(f *testing.F) {
 	f.Fuzz(func(t *testing.T, data []byte) {
 		// Prefix with MsgFundingLocked.
-		data = prefixWithMsgType(data, MsgFundingLocked)
+		data = prefixWithMsgType(data, MsgChannelReady)
 
 		// Pass the message into our general fuzz harness for wire
 		// messages!

lnwire/lnwire_test.go

@@ -566,7 +566,7 @@ func TestLightningWireProtocol(t *testing.T) {
 
 			v[0] = reflect.ValueOf(req)
 		},
-		MsgFundingLocked: func(v []reflect.Value, r *rand.Rand) {
+		MsgChannelReady: func(v []reflect.Value, r *rand.Rand) {
 
 			var c [32]byte
 			if _, err := r.Read(c[:]); err != nil {
@@ -1013,7 +1013,7 @@ func TestLightningWireProtocol(t *testing.T) {
 			},
 		},
 		{
-			msgType: MsgFundingLocked,
+			msgType: MsgChannelReady,
 			scenario: func(m ChannelReady) bool {
 				return mainScenario(&m)
 			},

lnwire/message.go

@@ -31,7 +31,7 @@ const (
 	MsgAcceptChannel                       = 33
 	MsgFundingCreated                      = 34
 	MsgFundingSigned                       = 35
-	MsgFundingLocked                       = 36
+	MsgChannelReady                        = 36
 	MsgShutdown                            = 38
 	MsgClosingSigned                       = 39
 	MsgUpdateAddHTLC                       = 128
@@ -88,7 +88,7 @@ func (t MessageType) String() string {
 		return "MsgFundingCreated"
 	case MsgFundingSigned:
 		return "MsgFundingSigned"
-	case MsgFundingLocked:
+	case MsgChannelReady:
 		return "FundingLocked"
 	case MsgShutdown:
 		return "Shutdown"
@@ -190,7 +190,7 @@ func makeEmptyMessage(msgType MessageType) (Message, error) {
 		msg = &FundingCreated{}
 	case MsgFundingSigned:
 		msg = &FundingSigned{}
-	case MsgFundingLocked:
+	case MsgChannelReady:
 		msg = &ChannelReady{}
 	case MsgShutdown:
 		msg = &Shutdown{}