Merge pull request #3959 from leoetlino/d3d-bbox-fix

D3D: Fix crash on start with BBox enabled

Source/Core/VideoBackends/D3D/main.cpp

@@ -162,6 +162,7 @@ void VideoBackend::Video_Prepare()
   PixelShaderCache::Init();
   GeometryShaderCache::Init();
   D3D::InitUtils();
+  BBox::Init();
 }
 
 void VideoBackend::Shutdown()

Source/Core/VideoBackends/D3D12/main.cpp

@@ -181,6 +181,7 @@ void VideoBackend::Video_Prepare()
   StaticShaderCache::Init();
   StateCache::Init();  // PSO cache is populated here, after constituent shaders are loaded.
   D3D::InitUtils();
+  BBox::Init();
 }
 
 void VideoBackend::Shutdown()