Revert "Use smaller chunks (see https://github.com/slimphp/Slim/issues/1836)"

This reverts commit fca0ab6b49.

index.php

@@ -16,13 +16,7 @@ require_once __DIR__.'/vendor/autoload.php';
 use Alltube\VideoDownload;
 use Alltube\Controller\FrontController;
 
-$app = new \Slim\App(
-    array(
-        'settings'=>array(
-            'responseChunkSize'=>1024
-        )
-    )
-);
+$app = new \Slim\App();
 $container = $app->getContainer();
 $container['view'] = function ($c) {
     $view = new \Slim\Views\Smarty(__DIR__.'/templates/');