fixed duplicated pragma exclude

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightStandardUnlit.shader

             #pragma prefer_hlslcc gles
             #pragma exclude_renderers d3d11_9x
 
-            #pragma exclude_renderers d3d11_9x
             #pragma vertex vert
             #pragma fragment frag
             #pragma multi_compile_fog