Enable stripping by default

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipelineAsset.cs

             return renderPipelineSettings;
         }
 
-        public bool allowShaderVariantStripping = false;
+        public bool allowShaderVariantStripping = true;
 
         [SerializeField]
         public DiffusionProfileSettings diffusionProfileSettings;