Merge pull request #1437 from Unity-Technologies/sg/fixhdunlit

Fixed HD Unlit filepath

com.unity.render-pipelines.high-definition/HDRP/Editor/ShaderGraph/HDUnlitSubShader.cs

 
         private static bool GenerateShaderPass(UnlitMasterNode masterNode, Pass pass, GenerationMode mode, SurfaceMaterialOptions materialOptions, ShaderGenerator result)
         {
-            var templateLocation = ShaderGenerator.GetTemplatePath(pass.TemplateName);
+            var templateLocation = Path.Combine(Path.Combine(Path.Combine(HDEditorUtils.GetHDRenderPipelinePath(), "Editor"), "ShaderGraph"), pass.TemplateName);
             if (!File.Exists(templateLocation))
             {
                 // TODO: produce error here