LibWeb: Use 'now' from EventLoop for animation frame callbacks

Previously, 'now' was set to the time `requestAnimationFrame()` was
called, and the EventLoop's 'now' was ignored. This was a little odd and
meant the time was always in the past.

Userland/Libraries/LibWeb/HTML/AnimationFrameCallbackDriver.h

@@ -43,11 +43,11 @@ struct AnimationFrameCallbackDriver {
         return true;
     }
 
-    void run()
+    void run(double now)
     {
         auto taken_callbacks = move(m_callbacks);
         for (auto& [id, callback] : taken_callbacks)
-            callback(id);
+            callback(now);
     }
 
     bool has_callbacks() const