Mobile: Uncomment code required for fog rendering on clear color

(cherry picked from commit db17415df837f4900fed418c9c7646632ef2bba0)

servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.cpp

@@ -805,24 +805,20 @@ void RenderForwardMobile::_render_scene(RenderDataRD *p_render_data, const Color
 				clear_color.r *= bg_energy_multiplier;
 				clear_color.g *= bg_energy_multiplier;
 				clear_color.b *= bg_energy_multiplier;
-				/*
-				if (p_render_data->render_buffers->has_custom_data(RB_SCOPE_FOG) || environment_get_fog_enabled(p_render_data->environment)) {
+				if (environment_get_fog_enabled(p_render_data->environment)) {
 					draw_sky_fog_only = true;
 					RendererRD::MaterialStorage::get_singleton()->material_set_param(sky.sky_scene_state.fog_material, "clear_color", Variant(clear_color.srgb_to_linear()));
 				}
-				*/
 			} break;
 			case RS::ENV_BG_COLOR: {
 				clear_color = environment_get_bg_color(p_render_data->environment);
 				clear_color.r *= bg_energy_multiplier;
 				clear_color.g *= bg_energy_multiplier;
 				clear_color.b *= bg_energy_multiplier;
-				/*
-				if (p_render_data->render_buffers->has_custom_data(RB_SCOPE_FOG) || environment_get_fog_enabled(p_render_data->environment)) {
+				if (environment_get_fog_enabled(p_render_data->environment)) {
 					draw_sky_fog_only = true;
 					RendererRD::MaterialStorage::get_singleton()->material_set_param(sky.sky_scene_state.fog_material, "clear_color", Variant(clear_color.srgb_to_linear()));
 				}
-				*/
 			} break;
 			case RS::ENV_BG_SKY: {
 				draw_sky = true;