Revert "rpc: include the FinalCltvDelta when writing new invoices to disk"

This reverts commit 4e264ee88e.

rpcserver.go

@@ -2660,8 +2660,7 @@ func (r *rpcServer) AddInvoice(ctx context.Context,
 		Receipt:        invoice.Receipt,
 		PaymentRequest: []byte(payReqString),
 		Terms: channeldb.ContractTerm{
-			Value:          amtMSat,
-			FinalCltvDelta: uint16(payReq.MinFinalCLTVExpiry()),
+			Value: amtMSat,
 		},
 	}
 	copy(i.Terms.PaymentPreimage[:], paymentPreimage[:])