Removed an unnecessary #pragma from the CopyDepthMSAA shader.

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightCopyDepthMSAA.shader

             ZTest Always ZWrite On ColorMask 0
 
             HLSLPROGRAM
-            // Required to compile gles 2.0 with standard srp library
-            #pragma prefer_hlslcc gles
             #pragma exclude_renderers d3d11_9x
             #pragma vertex vert
             #pragma fragment frag