Revert "Devirtualize Register/Unregister and use a wrapper instead."

- Fixes graphical issues from transitions in Super Mario Odyssey.

src/video_core/rasterizer_cache.h

@@ -132,7 +132,7 @@ protected:
     }
 
     /// Register an object into the cache
-    void Register(const T& object) {
+    virtual void Register(const T& object) {
         std::lock_guard<std::recursive_mutex> lock{mutex};
 
         object->SetIsRegistered(true);
@@ -142,7 +142,7 @@ protected:
     }
 
     /// Unregisters an object from the cache
-    void Unregister(const T& object) {
+    virtual void Unregister(const T& object) {
         std::lock_guard<std::recursive_mutex> lock{mutex};
 
         object->SetIsRegistered(false);