Remove trailing spaces.

config_default.php

@@ -252,9 +252,9 @@
     /*
      * If you use a Sony eReader or Aldiko you can't download ebooks if your catalog
      * is password protected. A simple workaround is to leave fetch.php not protected (see .htaccess).
-     * But In that case your COPS installation is not completely safe. 
+     * But In that case your COPS installation is not completely safe.
      * Setting this parameter to "1" ensure that nobody can access fetch.php before accessing
-     * index.php or feed.php first. 
+     * index.php or feed.php first.
      * BEWARE : Do not touch this if you're not using password, not using PRS-TX or not using Aldiko.
      */
     $config ['cops_fetch_protect'] = "0";