lnwire: remove the Validate method from the Message interface

This commit revues the Validate method from the Message interface as
the method is no longer used and is a relic from an older version of
the codebase.

lnwire/init_message.go

@@ -70,21 +70,3 @@ func (msg *Init) Command() uint32 {
 func (msg *Init) MaxPayloadLength(uint32) uint32 {
 	return 2 + maxAllowedSize + 2 + maxAllowedSize
 }
-
-// Validate performs any necessary sanity checks to ensure all fields present
-// on the Init are valid.
-//
-// This is part of the lnwire.Message interface.
-func (msg *Init) Validate() error {
-	if msg.GlobalFeatures.serializedSize() > maxAllowedSize {
-		return errors.Errorf("global feature vector exceed max allowed "+
-			"size %v", maxAllowedSize)
-	}
-
-	if msg.LocalFeatures.serializedSize() > maxAllowedSize {
-		return errors.Errorf("local feature vector exceed max allowed "+
-			"size %v", maxAllowedSize)
-	}
-
-	return nil
-}