Removed useless code

ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipeline.cs

         {
             Clear             = 0,                    // 0x0
             Lighting          = 3,                    // 0x3  - 2 bit
-            DistortionEnabled = 4,                    // 0x4  - 1 bit
             All               = 255                   // 0xFF - 8 bit
         }
 

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

                 Ref  [_StencilRef]
                 Comp Always
                 Pass Replace
-                ReadMask 3
-                WriteMask 3
             }
 
             HLSLPROGRAM