LibJS+LibWeb: Pass prototype to Object constructor

Everyone who constructs an Object must now pass a prototype object when
applicable. There's still a fair amount of code that passes something
fetched from the Interpreter, but this brings us closer to being able
to detach prototypes from Interpreter eventually.

Libraries/LibWeb/Bindings/EventTargetWrapper.cpp

@@ -37,7 +37,8 @@ namespace Web {
 namespace Bindings {
 
 EventTargetWrapper::EventTargetWrapper(EventTarget& impl)
-    : m_impl(impl)
+    : Wrapper(*interpreter().object_prototype())
+    , m_impl(impl)
 {
     put_native_function("addEventListener", add_event_listener, 2);
 }