Fix #1427

`\craft\helpers\Assets::generateUrl` no longer takes an FS as first argument (see [here](craftcms/cms#14353)). Craft 5 only.

src/helpers/AssetHelper.php

@@ -117,7 +117,7 @@ public static function indexExistingFile($urlFromFeed, string $conflict, $field
         $asset->folderId = $folder->id;
         $asset->folderPath = $folder->path;
         $asset->volumeId = $volume->id;
-        $targetUrl = AssetsHelper::generateUrl($volume->getFs(), $asset);
+        $targetUrl = AssetsHelper::generateUrl($asset);
 
         $rootUrl = $volume->getRootUrl() ?? '';
         $targetPath = str_replace($rootUrl, '', $targetUrl);