Merge pull request #1307 from Unity-Technologies/Fix-wrong-preprocessor-test-intepolateor

Fix wrong preprocessor test for distortion (for PR 1305)

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

 #define VARYINGS_NEED_TANGENT_TO_WORLD
 #endif
 
+#define VARYINGS_NEED_TEXCOORD0 // Always use with distortion
+
-    #define VARYINGS_NEED_TEXCOORD0
     #define VARYINGS_NEED_TEXCOORD1
     #ifdef ATTRIBUTES_NEED_TEXCOORD2
     #define VARYINGS_NEED_TEXCOORD2