Backend : correction affichage des images dans les formulaires

ShopBundle/Twig/FrontendTwigExtension.php

                 if (substr($path, 0, 1) === '/') $path = substr($path, 1);
 
                 if ($path) {
-                        if (strpos($path, $this->getFileManagerFolder()) === false) {
-                                $path = $this->getFileManagerFolder() . '/' . $path;
+                        $fileManagerFolder = substr($this->getFileManagerFolder(), 1)  ;
+
+                        if (strpos($path, $fileManagerFolder) === false) {
+                                $path = $fileManagerFolder . '/' . $path;
                         }
 
                         return $this->liipCacheHelper->getBrowserPath($path, $thumb);