Let you Quick Create in Queues that don't define the new status

Since we don't offer Status in the Quick Create widget, we should just
let Create pick the on_create default from the Queue's lifecycle.

While in here, update RT::Ticket::Create to have less lying around what
to pass for Status (valid statuses haven't listed been in
RT::Queue in 4.0 or 4.2).

We started using the default from the Queue's Lifecycle in b206b50a,
which is the same commit where we stopped hardcoding 'new' in
RT::Ticket::Create.

Found in RTIR user since 3 of the 4 RTIR queues don't allow tickets
with the new status.
Merge branch '4.0/stop-hardcoding-new' into 4.0-trunk