MAGETWO-44552: [Github] Installer Readiness Check does not check file permissions recursively

- fixed static error

Author: mazhalai

setup/src/Magento/Setup/Model/FilePermissions.php

@@ -130,7 +130,7 @@ private function checkRecursiveDirectories($directory)
             new \RecursiveDirectoryIterator($directory),
             \RecursiveIteratorIterator::LEAVES_ONLY | \RecursiveIteratorIterator::CATCH_GET_CHILD
         );
-        foreach($directoryIterator as $subDirectory) {
+        foreach ($directoryIterator as $subDirectory) {
             if ($subDirectory->isDir() && !$subDirectory->isWritable()) {
                 $flag = false;
             }