Fixed a bug in "login as". Now the user can "re-login" as admin.

interface/web/login/index.php

@@ -111,7 +111,7 @@ class login_index {
 		                	$sql = "DELETE FROM `attempts_login` WHERE `ip`='{$ip}'";
 		                	$app->db->query($sql);
 		                	$user = $app->db->toLower($user);
-							if ($loginAs) $oldSession = $_SESSION['s_old'];
+							if ($loginAs) $oldSession = $_SESSION['s'];
 		                    $_SESSION = array();
 							if ($loginAs) $_SESSION['s_old'] = $oldSession; // keep the way back!
 		                    $_SESSION['s']['user'] = $user;