Update Fog node to latest SRP library

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Input/Scene/FogNode.cs

                 {
                     s.AppendLine("Color = unity_FogColor;");
 
-                    s.AppendLine("{0} clipZ_01 = UNITY_Z_0_FAR_FROM_CLIPSPACE(UnityObjectToClipPos(ObjectSpacePosition).z);", precision);
+                    s.AppendLine("{0} clipZ_01 = UNITY_Z_0_FAR_FROM_CLIPSPACE(mul(GetWorldToHClipMatrix(), mul(GetObjectToWorldMatrix(), ObjectSpacePosition)).z);", precision);
                     s.AppendLine("#if defined(FOG_LINEAR)");
                     using (s.IndentScope())
                     {