Merge pull request #519 from Unity-Technologies/Branch_FixBlacksmithSky

Fixed blacksmith sky renderer to use the right shader.

ScriptableRenderPipeline/HDRenderPipeline/Sky/BlacksmithlSky/BlacksmithSkyRenderer.cs

 
         public override void Build()
         {
-            m_ProceduralSkyMaterial = CoreUtils.CreateEngineMaterial("Hidden/HDRenderPipeline/Sky/SkyProcedural");
+            m_ProceduralSkyMaterial = CoreUtils.CreateEngineMaterial("Hidden/HDRenderPipeline/Sky/SkyBlacksmith");
         }
 
         public override void Cleanup()