Examples: Clean up. (#26639)

examples/webgl_postprocessing_fxaa.html

@@ -122,7 +122,6 @@
 				//
 
 				const renderPass = new RenderPass( scene, camera );
-				renderPass.clearColor = new THREE.Color( 0, 0, 0 );
 				renderPass.clearAlpha = 0;
 
 				//