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/LibJS/Runtime/NumberObject.cpp

@@ -40,9 +40,9 @@ NumberObject* NumberObject::create(GlobalObject& global_object, double value)
 }
 
 NumberObject::NumberObject(double value, Object& prototype)
-    : m_value(value)
+    : Object(&prototype)
+    , m_value(value)
 {
-    set_prototype(&prototype);
 }
 
 NumberObject::~NumberObject()