Reverted the additional instancing ID in the vertex input.

com.unity.render-pipelines.lightweight/LWRP/Editor/ShaderGraph/LightWeightPBRSubShader.cs

 
                 foreach (var channel in vertexRequirements.requiresMeshUVs.Distinct())
                     vertexDescriptionInputStruct.AppendLine("half4 {0};", channel.GetUVName());
-
-                vertexDescriptionInputStruct.AppendLine("UNITY_VERTEX_INPUT_INSTANCE_ID");
+                
             }
 
             // -------------------------------------