Common: Make HookableEvent use non-static data.

Co-authored-by: Dentomologist <dentomologist@gmail.com>

Source/Core/VideoCommon/Widescreen.cpp

@@ -29,7 +29,10 @@ WidescreenManager::WidescreenManager()
                  "Invalid suggested aspect ratio mode: only Auto, 4:3 and 16:9 are supported");
   }
 
-  m_config_changed = ConfigChangedEvent::Register(
+  auto& system = Core::System::GetInstance();
+  auto& video_events = system.GetVideoEvents();
+
+  m_config_changed = video_events.config_changed_event.Register(
       [this](u32 bits) {
         if (bits & (CONFIG_CHANGE_BIT_ASPECT_RATIO))
         {
@@ -45,10 +48,9 @@ WidescreenManager::WidescreenManager()
       "Widescreen");
 
   // VertexManager doesn't maintain statistics in Wii mode.
-  auto& system = Core::System::GetInstance();
   if (!system.IsWii())
   {
-    m_update_widescreen = AfterFrameEvent::Register(
+    m_update_widescreen = video_events.after_frame_event.Register(
         [this](Core::System&) { UpdateWidescreenHeuristic(); }, "WideScreen Heuristic");
   }
 }