Examples: Use touchAction in webgl_multiple_scenes_comparison.

examples/webgl_multiple_scenes_comparison.html

@@ -131,14 +131,9 @@
 
 				}
 
+				slider.style.touchAction = 'none'; // disable touch scroll
 				slider.addEventListener( 'pointerdown', onPointerDown );
 
-				slider.addEventListener( 'touchstart', function ( event ) {
-
-					event.preventDefault(); // prevent scrolling
-
-				} );
-
 			}
 
 			function onWindowResize() {