fixed php warning

sites/all/themes/gui/materiobasetheme/preprocess/field.pre.php

@@ -17,8 +17,8 @@ if($vars['element']['#field_name'] == 'field_materiau_image'){
     && !isset($user->roles[12]) // translator
     && !isset($user->roles[13]) // admin showroom
     && !isset($user->roles[3]) // admin
-    && !isset($user->roles[4]) // root
-    && in_array($view_mode, $vm)){
+    && !isset($user->roles[4])){ // root
+    // && in_array($view_mode, $vm)){
 		$items = $vars['items'];
 		$vars['items'] = array($items[0]);
 	}