bitcoindnotify: fix subtest closure in unit tests

docs/release-notes/release-notes-0.16.0.md

@@ -300,6 +300,9 @@ data.
 * Payment related code [has been
   refactored](https://github.com/lightningnetwork/lnd/pull/7174) to allow the
   usage of new payment statuses.
+
+* [Fixed a test closure](https://github.com/lightningnetwork/lnd/pull/7337)
+  issue found in `bitcoindnotify/bitcoind_test.go`.
  
 ## Watchtowers