config.php: reduce default login cookie expire timeout

inc/config.php

@@ -172,7 +172,7 @@
 
     // How long should the cookies last (in seconds). Defines how long should moderators should remain logged
     // in (0 = browser session).
-    $config['cookies']['expire'] = 60 * 60 * 24 * 30 * 6; // ~6 months
+    $config['cookies']['expire'] = 60 * 60 * 24 * 7; // 1 week.
 
     // Make this something long and random for security.
     $config['cookies']['salt'] = 'abcdefghijklmnopqrstuvwxyz09123456789!@#$%^&*()';