Cleanup clearcoat example (#15594)

The components needed for `DirectionalLight` are added automatically
since #15554
`create_point_light` already existed and returns a `PointLight` with
these same settings

examples/3d/clearcoat.rs

@@ -23,9 +23,8 @@ use bevy::{
     color::palettes::css::{BLUE, GOLD, WHITE},
     core_pipeline::{tonemapping::Tonemapping::AcesFitted, Skybox},
     math::vec3,
-    pbr::{CascadeShadowConfig, Cascades, CascadesVisibleEntities},
     prelude::*,
-    render::{primitives::CascadesFrusta, texture::ImageLoaderSettings},
+    render::texture::ImageLoaderSettings,
 };
 
 /// The size of each sphere.
@@ -184,19 +183,7 @@ fn spawn_scratched_gold_ball(
 
 /// Spawns a light.
 fn spawn_light(commands: &mut Commands) {
-    commands.spawn((
-        PointLight {
-            color: WHITE.into(),
-            intensity: 100000.0,
-            ..default()
-        },
-        // Add the cascades objects used by the `DirectionalLight`, since the
-        // user can toggle between a point light and a directional light.
-        CascadesFrusta::default(),
-        Cascades::default(),
-        CascadeShadowConfig::default(),
-        CascadesVisibleEntities::default(),
-    ));
+    commands.spawn(create_point_light());
 }
 
 /// Spawns a camera with associated skybox and environment map.