always linearize lightgrid before interpolation, this is correct

Author: illwieckz

src/engine/renderer/glsl_source/computeLight_fp.glsl

@@ -67,13 +67,8 @@ vec4 EnvironmentalSpecularFactor( vec3 viewDir, vec3 normal )
 		ambientColor = ambientScale * texel.rgb;
 		lightColor = directedScale * texel.rgb;
 
-		#if defined(r_cheapSRGB)
-			/* The light grid conversion from sRGB is done in C++ code
-			when loading it, meaning it's done before interpolation. */
-		#else
-			convertFromSRGB(lightColor, linearizeLightMap);
-			convertFromSRGB(ambientColor, linearizeLightMap);
-		#endif
+		/* The light grid conversion from sRGB is done in C++ code
+		when loading it, so it's done before interpolation. */
 
 		ambientColor *= lightFactor;
 		lightColor *= lightFactor;

src/engine/renderer/tr_bsp.cpp

@@ -4157,16 +4157,8 @@ void R_LoadLightGrid( lump_t *l )
 
 			if ( tr.worldLinearizeLightMap )
 			{
-				if ( r_cheapSRGB.Get() )
-				{
-					ambientColor[ j ] = convertFromSRGB( ambientColor[ j ] );
-					directedColor[ j ] = convertFromSRGB( directedColor[ j ] );
-				}
-				else
-				{
-					/* When not cheap, the light grid conversion from sRGB is done
-					in GLSL code after interpolation. */
-				}
+				ambientColor[ j ] = convertFromSRGB( ambientColor[ j ] );
+				directedColor[ j ] = convertFromSRGB( directedColor[ j ] );
 			}
 		}