Cleanup examples (#27795)

As far as I can tell, setting `material.isClipping` doesn't do anything?

examples/webgpu_clipping.html

@@ -110,7 +110,6 @@
 
 				} );
 
-				material.isClipping = true;
 				const geometry = new THREE.TorusKnotGeometry( 0.4, 0.08, 95, 20 );
 
 				object = new THREE.Mesh( geometry, material );