### Godot version

4.1.1

### System information

windows 11, mobile renderer

### Issue description

On Mobile Vulkan renderer, the clear color is 50% lighter than expected

See steps to reproduce and Minimal reproduction project below.

The box and background have the same color on Forward+ and compatibility, but not on Mobile
happens also in runtime on exported project, not only in editor preview

Images of the same scene from
compatibility:
![compatibility](https://github.com/godotengine/godot/assets/11915378/a874fa86-c16f-43ef-aed7-c2066b770ac1)
Forward+:
![forward](https://github.com/godotengine/godot/assets/11915378/e416f9a6-dfd4-4c47-bbc2-b552ca58f83c)
Mobile:
![mobile](https://github.com/godotengine/godot/assets/11915378/e28e2db8-f7c3-47e2-8c0a-44ce937c9270)


### Steps to reproduce

 - add a CSGBox3D with "unshaded" shading, and albedo of #545454
 - add environment with Background = Custom color and color of #545454

Box and background are not the same color

### Minimal reproduction project

[bg_color.zip](https://github.com/godotengine/godot/files/12174822/bg_color.zip)

while (geometry_instance_dirty_list.first()) {
		_geometry_instance_update(geometry_instance_dirty_list.first()->self());
	}
}
void RenderForwardMobile::_geometry_instance_dependency_changed(Dependency::DependencyChangedNotification p_notification, DependencyTracker *p_tracker) {
	switch (p_notification) {
		case Dependency::DEPENDENCY_CHANGED_MATERIAL:
		case Dependency::DEPENDENCY_CHANGED_MESH:
		case Dependency::DEPENDENCY_CHANGED_PARTICLES:
		case Dependency::DEPENDENCY_CHANGED_MULTIMESH:
		case Dependency::DEPENDENCY_CHANGED_SKELETON_DATA: {
			static_cast<RenderGeometryInstance *>(p_tracker->userdata)->_mark_dirty();
			static_cast<GeometryInstanceForwardMobile *>(p_tracker->userdata)->data->dirty_dependencies = true;
		} break;
		case Dependency::DEPENDENCY_CHANGED_MULTIMESH_VISIBLE_INSTANCES: {
			GeometryInstanceForwardMobile *ginstance = static_cast<GeometryInstanceForwardMobile *>(p_tracker->userdata);
			if (ginstance->data->base_type == RS::INSTANCE_MULTIMESH) {
				ginstance->instance_count = RendererRD::MeshStorage::get_singleton()->multimesh_get_instances_to_draw(ginstance->data->base);
			}
		} break;
		default: {
			
		} break;
	}
}
void RenderForwardMobile::_geometry_instance_dependency_deleted(const RID &p_dependency, DependencyTracker *p_tracker) {