Fixing Module Class Suffix in mod_menu

Tracker item: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31247

The problem has been found in joomla 2.5, but it looks like the same problem is also present in the Joomla 3.x 

mod_menu.xml file contains two fields:

<field
name="class_sfx"
type="text"
label="MOD_MENU_FIELD_CLASS_LABEL" ...

<field
name="moduleclass_sfx"
type="textarea" rows="3"
label="COM_MODULES_FIELD_MODULECLASS_SFX_LABEL" ...

but the second field is not used in the module.