Horde_Secret: Fix up cookie key name on key change / unset

This was introduced by commit

00191e0

[mms] If secret key is changed, change the associated $_COOKIE key
or else key change may not be recognized in the current page access (Bug #11570).

Signed-off-by: Michael M Slusarz <slusarz@horde.org>

framework/Secret/lib/Horde/Secret.php

@@ -215,9 +215,9 @@ protected function _setCookie($keyname, $key)
         );
 
         if ($key === false) {
-            unset($_COOKIE[$keyname], $this->_keyCache[$keyname]);
+            unset($_COOKIE[$keyname . '_key'], $this->_keyCache[$keyname]);
         } else {
-            $_COOKIE[$keyname] = $this->_keyCache[$keyname] = $key;
+            $_COOKIE[$keyname . '_key'] = $this->_keyCache[$keyname] = $key;
         }
     }