Renamed LW shaders and changed the default to be the Physically Based one.

ScriptableRenderPipeline/LightweightPipeline/LightweightPipelineAsset.asset

   m_LinearRendering: 1
   m_AttenuationTexture: {fileID: 2800000, guid: ee420ad43ff580149a07f10ad66c49ff,
     type: 3}
-  m_DefaultDiffuseMaterial: {fileID: 2100000, guid: 6a1143ee683302f4aa628c052723efc1,
+  m_DefaultDiffuseMaterial: {fileID: 2100000, guid: 31321ba15b8f8eb4c954353edc038b1d,
     type: 2}
   m_DefaultParticleMaterial: {fileID: 2100000, guid: e823cd5b5d27c0f4b8256e7c12ee3e6d,
     type: 2}
     type: 2}
   m_DefaultUIMaterial: {fileID: 2100000, guid: 786cc499ea3906946b10ab7d24c8d0e7, type: 2}
-  m_DefaultShader: {fileID: 4800000, guid: 8d2bb70cbf9db8d4da26e15b26e74248, type: 3}
+  m_DefaultShader: {fileID: 4800000, guid: 933532a4fcc9baf4fa0491de14d08ed7, type: 3}

ScriptableRenderPipeline/LightweightPipeline/Materials/Lightweight-StandardSimpleLighting.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Lightweight-Default
+  m_Name: Lightweight-StandardSimpleLighting
   m_Shader: {fileID: 4800000, guid: 8d2bb70cbf9db8d4da26e15b26e74248, type: 3}
   m_ShaderKeywords: _SPECULAR_COLOR
   m_LightmapFlags: 4

ScriptableRenderPipeline/LightweightPipeline/Shaders/LightweightStandardSimpleLighting.shader

 // Shader targeted for low end devices. Single Pass Forward Rendering. Shader Model 2
-Shader "ScriptableRenderPipeline/LightweightPipeline/NonPBR"
+Shader "ScriptableRenderPipeline/LightweightPipeline/Standard (Simple Lighting)"
 {
     // Keep properties of StandardSpecular shader for upgrade reasons.
     Properties
                 float3 worldPos = i.posWS.xyz;
 
                 half3 lightDirection;
-                
+
 #ifndef _MULTIPLE_LIGHTS
                 LightInput lightInput;
                 INITIALIZE_MAIN_LIGHT(lightInput);
 #else
                 half3 color = LightingLambert(diffuse, lightDirection, normal, lightAtten) * lightInput.color;
 #endif
-    
+
 #else
                 half3 color = half3(0, 0, 0);
 

ScriptableRenderPipeline/LightweightPipeline/Shaders/LightweightStandardShaderPBS.shader

-Shader "ScriptableRenderPipeline/LightweightPipeline/Standard"
+Shader "ScriptableRenderPipeline/LightweightPipeline/Standard (PBS)"
 {
     Properties
     {