HDRP: Provide more precision for spot light with narrow angle

com.unity.render-pipelines.high-definition/HDRP/Lighting/LightLoop/LightLoop.cs

                 var sinSpotOuterHalfAngle = Mathf.Sqrt(1.0f - cosSpotOuterHalfAngle * cosSpotOuterHalfAngle);
                 var cosSpotInnerHalfAngle = Mathf.Clamp(Mathf.Cos(spotAngle * 0.5f * innerConePercent * Mathf.Deg2Rad), 0.0f, 1.0f); // inner cone
 
-                var val = Mathf.Max(0.001f, (cosSpotInnerHalfAngle - cosSpotOuterHalfAngle));
+                var val = Mathf.Max(0.0001f, (cosSpotInnerHalfAngle - cosSpotOuterHalfAngle));
                 lightData.angleScale = 1.0f / val;
                 lightData.angleOffset = -cosSpotOuterHalfAngle * lightData.angleScale;