Added Ajax Support for change of Ticket type

If you change the ticket type, for example in AgentTicketNote, a
present ACL (If TicketType = 'Foo’ then Queue could only be
'Postmaster‘) is not called. It is just called when the view is
initially shown.

This commit add’s the behavior like it is in
AgentTicketEmail/AgentTicketPhone.

Regards

Johannes