Change a dangerous ID

The message id 0 is used intrinsically by the framework
for all messages without a specific ID. Using 0 here
we can't reliably use the post(Runnable) method on our
handler, because these would in *some* respects be taken
for update_suggestion messages, but not all.
For example, they'd be removed on removeMessage() but
they would not trigger the actual process. This would
lead to utter confusion.

Change-Id: I5d9b01d38e2ff090cd0d80c27421dc8a41c317b8