Fixed a compiler shader error introduced in last commit.

ScriptableRenderPipeline/LightweightPipeline/Shaders/LightweightLighting.cginc

         INITIALIZE_LIGHT(light, lightIter);
 
         half3 lightDirection;
-        half atten = GetLightDirectionAndAttenuation(light, normalWS, positionWS, lightDirection);
+        half atten = GetLightDirectionAndRealtimeAttenuation(light, normalWS, positionWS, lightDirection);
         half3 lightColor = light.color * atten;
         vertexLightColor += LightingLambert(lightColor, lightDirection, normalWS);
     }