f Use InvoiceRequestCreationFailed error in refund flow

src/payment/bolt12.rs

@@ -275,7 +275,7 @@ impl Bolt12Payment {
 	pub fn request_refund(&self, refund: &Refund) -> Result<Bolt12Invoice, Error> {
 		self.channel_manager.request_refund_payment(refund).map_err(|e| {
 			log_error!(self.logger, "Failed to request refund payment: {:?}", e);
-			Error::InvalidRefund
+			Error::InvoiceRequestCreationFailed
 		})
 	}