[FIX] ir.ui.menu: load web icons for all menus, not just top levels ones
[FIX] ir.ui.menu: load web icons for all menus, not just top levels ones

This is useful for portal, where a subtree of the menus
is used as top-level menu for portal users.

akretion/openerp-server,akretion/openerp-server,akretion/openerp-server