Fix issue #51897 (horizon occlusion causing black blob), fix ver. SP1

No, not service pack 1. Removes comments from the original fix commit.

drivers/gles2/shaders/scene.glsl

@@ -1688,12 +1688,12 @@ FRAGMENT_SHADER_CODE
 #ifdef USE_RADIANCE_MAP
 
 	vec3 ref_vec = reflect(-eye_position, N);
+	float horizon = min(1.0 + dot(ref_vec, normal), 1.0);
 	ref_vec = normalize((radiance_inverse_xform * vec4(ref_vec, 0.0)).xyz);
 
 	ref_vec.z *= -1.0;
 
 	specular_light = textureCubeLod(radiance_map, ref_vec, roughness * RADIANCE_MAX_LOD).xyz * bg_energy;
-	float horizon = min(1.0 + dot(ref_vec, normal), 1.0);
 	specular_light *= horizon * horizon;
 #ifndef USE_LIGHTMAP
 	{

drivers/gles3/shaders/scene.glsl

@@ -1884,10 +1884,10 @@ FRAGMENT_SHADER_CODE
 		{ //read radiance from dual paraboloid
 
 			vec3 ref_vec = reflect(-eye_vec, normal);
+			float horizon = min(1.0 + dot(ref_vec, normal), 1.0);
 			ref_vec = normalize((radiance_inverse_xform * vec4(ref_vec, 0.0)).xyz);
 			vec3 radiance = textureDualParaboloid(radiance_map, ref_vec, roughness) * bg_energy;
 			env_reflection_light = radiance;
-			float horizon = min(1.0 + dot(ref_vec, normal), 1.0);
 			env_reflection_light *= horizon * horizon;
 		}
 	}