Use the Light3D Indirect Energy property in SDFGI

The Indirect Energy property was previously ignored in SDFGI
(unlike VoxelGI).

doc/classes/Light3D.xml

@@ -47,7 +47,8 @@
 			The light's strength multiplier (this is not a physical unit). For [OmniLight3D] and [SpotLight3D], changing this value will only change the light color's intensity, not the light's radius.
 		</member>
 		<member name="light_indirect_energy" type="float" setter="set_param" getter="get_param" default="1.0">
-			Secondary multiplier used with indirect light (light bounces). Used with [VoxelGI].
+			Secondary multiplier used with indirect light (light bounces). Used with [VoxelGI] and SDFGI (see [member Environment.sdfgi_enabled]).
+			[b]Note:[/b] This property is ignored if [member light_energy] is equal to [code]0.0[/code], as the light won't be present at all in the GI shader.
 		</member>
 		<member name="light_negative" type="bool" setter="set_negative" getter="is_negative" default="false">
 			If [code]true[/code], the light's effect is reversed, darkening areas and casting bright shadows.

servers/rendering/renderer_rd/renderer_scene_gi_rd.cpp

@@ -1469,7 +1469,7 @@ void RendererSceneGIRD::SDFGI::pre_process_gi(const Transform3D &p_transform, Re
 			lights[idx].color[1] = color.g;
 			lights[idx].color[2] = color.b;
 			lights[idx].type = RS::LIGHT_DIRECTIONAL;
-			lights[idx].energy = storage->light_get_param(li->light, RS::LIGHT_PARAM_ENERGY);
+			lights[idx].energy = storage->light_get_param(li->light, RS::LIGHT_PARAM_ENERGY) * storage->light_get_param(li->light, RS::LIGHT_PARAM_INDIRECT_ENERGY);
 			lights[idx].has_shadow = storage->light_has_shadow(li->light);
 
 			idx++;
@@ -1514,7 +1514,7 @@ void RendererSceneGIRD::SDFGI::pre_process_gi(const Transform3D &p_transform, Re
 			lights[idx].color[1] = color.g;
 			lights[idx].color[2] = color.b;
 			lights[idx].type = storage->light_get_type(li->light);
-			lights[idx].energy = storage->light_get_param(li->light, RS::LIGHT_PARAM_ENERGY);
+			lights[idx].energy = storage->light_get_param(li->light, RS::LIGHT_PARAM_ENERGY) * storage->light_get_param(li->light, RS::LIGHT_PARAM_INDIRECT_ENERGY);
 			lights[idx].has_shadow = storage->light_has_shadow(li->light);
 			lights[idx].attenuation = storage->light_get_param(li->light, RS::LIGHT_PARAM_ATTENUATION);
 			lights[idx].radius = storage->light_get_param(li->light, RS::LIGHT_PARAM_RANGE);
@@ -1953,7 +1953,7 @@ void RendererSceneGIRD::SDFGI::render_static_lights(RID p_render_buffers, uint32
 				lights[idx].color[0] = color.r;
 				lights[idx].color[1] = color.g;
 				lights[idx].color[2] = color.b;
-				lights[idx].energy = storage->light_get_param(li->light, RS::LIGHT_PARAM_ENERGY);
+				lights[idx].energy = storage->light_get_param(li->light, RS::LIGHT_PARAM_ENERGY) * storage->light_get_param(li->light, RS::LIGHT_PARAM_INDIRECT_ENERGY);
 				lights[idx].has_shadow = storage->light_has_shadow(li->light);
 				lights[idx].attenuation = storage->light_get_param(li->light, RS::LIGHT_PARAM_ATTENUATION);
 				lights[idx].radius = storage->light_get_param(li->light, RS::LIGHT_PARAM_RANGE);