LibWeb: Implement Worker.postMessage(message, transfer)

Author: https://github.com/shannonbooth
Commit: bf81e2fd64
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2022

Userland/Libraries/LibWeb/HTML/Worker.idl

@@ -10,8 +10,7 @@ interface Worker : EventTarget {
     constructor(DOMString scriptURL, optional WorkerOptions options = {});
 
     undefined terminate();
-    // FIXME: IDL overload issue here
-    // FIXME: undefined postMessage(any message, sequence<object> transfer);
+    undefined postMessage(any message, sequence<object> transfer);
     undefined postMessage(any message, optional StructuredSerializeOptions options = {});
 
     attribute EventHandler onmessage;