Removed overly cautious #ifdef from slate vertex shader - we want to swizzle all platforms (the appropriate swizzle is applied).

#codereview Nick.Penwarden

[CL 2049902 by Joel Crabbe in Main branch]

Engine/Shaders/SlateVertexShader.usf

@@ -75,11 +75,8 @@ VertexOut Main(
 
 	// TextureCoordinates contains both the first and second texture coordinates in xy and zw respectively.
 	VOut.TextureCoordinates = InTextureCoordinates;
-#if ES2_PROFILE && COMPILER_GLSL_ES2
+
 	VOut.Color = InColor FCOLOR_COMPONENT_SWIZZLE;
-#else
-	VOut.Color = InColor;
-#endif
 
 	return VOut;
 }