PR fixes #1

- Change output shader layout to fix subgraphs

ShaderGraph/com.unity.shadergraph/Editor/Data/Util/GraphUtil.cs

 
                 finalShader.AppendLines(shaderProperties.GetPropertiesDeclaration(0));
 
+                finalShader.AppendLines(surfaceDescriptionInputStruct.ToString());
+                finalShader.AppendNewLine();
+
-                finalShader.AppendLines(surfaceDescriptionInputStruct.ToString());
-                finalShader.AppendNewLine();
                 finalShader.AppendLines(surfaceDescriptionStruct.ToString());
                 finalShader.AppendNewLine();
                 finalShader.AppendLines(surfaceDescriptionFunction.ToString());