Revert "We implement our own isset(), we need to check the form varia…

…ble name"

This always evaluates to true.

This reverts commit 5c5a1a5.

framework/Util/lib/Horde/Variables.php

@@ -105,7 +105,7 @@ public function sanitize()
      */
     public function exists($varname)
     {
-        return isset($varname);
+        return isset($this->$varname);
     }
 
     /**