LibWeb/IDB: Implement IDBTransaction::commit

Author: https://github.com/stelar7
Commit: da56c1b1eb
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4306
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibWeb/IndexedDB/IDBTransaction.idl

@@ -10,7 +10,7 @@ interface IDBTransaction : EventTarget {
     [SameObject, ImplementedAs=connection] readonly attribute IDBDatabase db;
     readonly attribute DOMException? error;
     [FIXME] IDBObjectStore objectStore(DOMString name);
-    [FIXME] undefined commit();
+    undefined commit();
     undefined abort();
     
     attribute EventHandler onabort;