Call done() in websockets/opening-handshake/003-sets-origin.worker.js (#11527)

This prevents the test harness to time out.
diff --git a/websockets/opening-handshake/003-sets-origin.worker.js b/websockets/opening-handshake/003-sets-origin.worker.js
index 86c4ef7..8746cca 100644
--- a/websockets/opening-handshake/003-sets-origin.worker.js
+++ b/websockets/opening-handshake/003-sets-origin.worker.js
@@ -15,3 +15,4 @@
   })
   ws.onerror = ws.onclose = t.unreached_func();
 }, "W3C WebSocket API - origin set in a Worker");
+done();