Remap Distortion Blur from 1 to 0 according to the doc (#6478)

Author: skhiat

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Changed sample scene in HDRP material samples: add shadow transparency (raster, ray-traced, path-traced).
 - Support for encoded HDR cubemaps, configurable via the HDR Cubemap Encoding project setting.
 - The rendering order of decals that have a similar draw order value was modified. The new order should be the reverse of the previous order.
+- Fixed default value of "Distortion Blur" from 1 to 0 according to the doc.
 
 ### Fixed
 - Fixed some XR devices: Pulling camera world space position from mainViewConstants instead of transform.

com.unity.render-pipelines.high-definition/Editor/Material/ShaderGraph/HDBlockFields.cs

@@ -40,7 +40,7 @@ public struct SurfaceDescription
             public static BlockFieldDescriptor Distortion = new BlockFieldDescriptor(SurfaceDescription.name, "Distortion", "SURFACEDESCRIPTION_DISTORTION",
                 new Vector2Control(Vector2.zero), ShaderStage.Fragment); // TODO: Lit is Vector2(2.0f, -1.0f)
             public static BlockFieldDescriptor DistortionBlur = new BlockFieldDescriptor(SurfaceDescription.name, "DistortionBlur", "Distortion Blur", "SURFACEDESCRIPTION_DISTORTIONBLUR",
-                new FloatControl(1.0f), ShaderStage.Fragment);
+                new FloatControl(0.0f), ShaderStage.Fragment);
             public static BlockFieldDescriptor ShadowTint = new BlockFieldDescriptor(SurfaceDescription.name, "ShadowTint", "Shadow Tint", "SURFACEDESCRIPTION_SHADOWTINT",
                 new ColorRGBAControl(Color.black), ShaderStage.Fragment);