threads: rebuild server threads when updating threads

The addition of the iterator factory added a thread builder when using
server side threads. A conditional for returning UIDs when selecting
messages would check for a not-nil store.builder, and return UIDs from
the thread builder. When using server side threads, there was no
mechanism to update the threads after a message deletion or move, so
store.Uids() would return a stale set of UIDs. This would allow the user
to "select" a deleted email (the cursor would disappear).

Add an update mechanism for the threads if server side threads are
enabled. When building thread UIDs, check for deleted or hidden threads.

Fixes: https://todo.sr.ht/~rjarry/aerc/123
Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
Tested-by: Inwit <inwit@sindominio.net>

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