channeldb+lnwire: rename MsgFundingLocked to MsgChannelReady

This commit is created by running,

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

gco master channeldb/migration
```

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{}