Update S3fsImageStyleDownloadController.php

Closes #3196885

src/Controller/S3fsImageStyleDownloadController.php

@@ -55,7 +55,7 @@ class S3fsImageStyleDownloadController extends ImageStyleDownloadController {
     // The $target variable for a derivative of a style has
     // styles/<style_name>/... as structure, so we check if the $target variable
     // starts with styles/.
-    $valid = !empty($image_style) && \Drupal::service('file_system')->validScheme($scheme);
+    $valid = !empty($image_style) && \Drupal::service('stream_wrapper_manager')->isValidScheme($scheme);
     if (!$this->config('image.settings')->get('allow_insecure_derivatives') || strpos(ltrim($target, '\/'), 'styles/') === 0) {
       $valid &= $request->query->get(IMAGE_DERIVATIVE_TOKEN) === $image_style->getPathToken($image_uri);
     }