fix prepare request in recovery message

src/DBFTPlugin/Consensus/ConsensusContext.MakePayload.cs

@@ -139,6 +139,7 @@ public ExtensiblePayload MakeRecoveryMessage()
                     Timestamp = Block.Timestamp,
                     Nonce = Block.Nonce,
                     BlockIndex = Block.Index,
+                    ValidatorIndex = Block.PrimaryIndex,
                     TransactionHashes = TransactionHashes
                 };
             }