Hide voicemail tab if voicemail disabled

If the voicemail setting has been globally disabled, hide the voicemail tab in csc

etc/csc.conf

@@ -49,7 +49,11 @@
     </site_config>
     <main_menu desktop="[% www_csc.main_menu.desktop %]"
                calllist="[% www_csc.main_menu.calllist %]"
+               [% IF asterisk.voicemail.enable == "yes" %]
                voicebox="[% www_csc.main_menu.voicebox %]"
+               [% ELSE %]
+               voicebox="0"
+               [% END %]
                addressbook="[% www_csc.main_menu.addressbook %]"
                callforward="[% www_csc.main_menu.callforward %]"
                callblock="[% www_csc.main_menu.callblock %]"