Move BoundingBox out of RenderBase

They were essentially just pass-though methods

Source/Core/VideoCommon/AsyncRequests.cpp

@@ -6,6 +6,8 @@
 #include <mutex>
 
 #include "Core/System.h"
+
+#include "VideoCommon/BoundingBox.h"
 #include "VideoCommon/Fifo.h"
 #include "VideoCommon/RenderBase.h"
 #include "VideoCommon/Statistics.h"
@@ -157,7 +159,7 @@ void AsyncRequests::HandleEvent(const AsyncRequests::Event& e)
     break;
 
   case Event::BBOX_READ:
-    *e.bbox.data = g_renderer->BBoxRead(e.bbox.index);
+    *e.bbox.data = g_bounding_box->Get(e.bbox.index);
     break;
 
   case Event::FIFO_RESET: