Fixed spotlights in LW PBR.

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/LightweightPassLit.hlsl

 {
     float2 uv                       : TEXCOORD0;
     DECLARE_LIGHTMAP_OR_SH(lightmapUV, vertexSH, 1);
-#ifdef _ADDITIONAL_LIGHTS
-#endif
 
 #ifdef _NORMALMAP
     half4 normal                    : TEXCOORD3;    // xyz: normal, w: viewDir.x
 {
     inputData = (InputData)0;
 
-#ifdef _ADDITIONAL_LIGHTS
-#endif
 
 #ifdef _NORMALMAP
     half3 viewDir = half3(IN.normal.w, IN.tangent.w, IN.binormal.w);
 #endif
 #endif
 
-#if _ADDITIONAL_LIGHTS
-#endif
 
     return o;
 }