Name refactor on ShaderGUIs

ScriptableRenderPipeline/LightweightPipeline/Editor/ShaderGUI/LightweightStandardSimpleLightingGUI.cs

 using UnityEngine;
 using UnityEditor.Experimental.Rendering.LightweightPipeline;
 
-public class LightweightPipelineMaterialEditor : ShaderGUI
+public class LightweightStandardSimpleLightingGUI : ShaderGUI
 {
     private const float kMinShininessValue = 0.01f;
     private MaterialProperty blendModeProp = null;

ScriptableRenderPipeline/LightweightPipeline/Editor/ShaderGUI/LightweightStandardGUI.cs

 
 namespace UnityEditor
 {
-    internal class LightweightStandardShaderGUI : ShaderGUI
+    internal class LightweightStandardGUI : ShaderGUI
     {
         public enum WorkflowMode : int
         {