Make line lights work without range attenuation

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/Lit.hlsl

     // We define the ellipsoid s.t. r1 = (r + len / 2), r2 = r3 = r.
     // TODO: This could be precomputed.
     float radius         = rsqrt(lightData.invSqrAttenuationRadius);
-    float invAspectRatio = radius / (radius + (0.5 * len));
+    float invAspectRatio = saturate(radius / (radius + (0.5 * len)));
 
     // Compute the light attenuation.
     float intensity = EllipsoidalDistanceAttenuation(unL, lightData.invSqrAttenuationRadius,