[FIX] Function action_wait

File "/opt/openerp/openerp/osv/orm.py", line 374, in function_proxy
    return attr(self._cr, self._uid, [self._id], *args, **kwargs)
  File "/opt/openerp/openerp/addons/sale_stock/sale_stock.py", line 222, in action_wait
    res = super(sale_order, self).action_wait(cr, uid, ids, context=context)
TypeError: action_wait() got an unexpected keyword argument 'context'