test(ocap-kernel): pass restartVat to the router in the result-promise test

#1084 landed with a router built positionally, so the logger took the slot
the new parameter added and the `already settled` assertions saw nothing.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: sirtimid

packages/ocap-kernel/src/KernelRouter.result-promise.test.ts

@@ -43,6 +43,7 @@ describe('a result promise whose delivery fails', () => {
       kernelQueue,
       () => endpoint,
       () => undefined,
+      async () => undefined,
       logger,
     );