fix expected error message

tests/transfers.rs

@@ -510,7 +510,7 @@ fn rbf_transfer() {
 
 #[rstest]
 #[should_panic(
-    expected = "the invoice requirements can't be fulfilled using available assets or smart contract state."
+    expected = "called `Result::unwrap()` on an `Err` value: Composition(InsufficientState)"
 )]
 #[case(TransferType::Blinded)]
 #[case(TransferType::Witness)]