Fix out-of-sync updates during grid change

This is a combination of two issues:

1. Widget updates are not passed to the holder when the launcher binding starts
2. Updates from widgetHost.startListening() are overriden by out-of-date info

Fix: 322919716
Test: Manual
Flag: N/A
Change-Id: I9665117412c87b19ed5d98263bb4f9b8da21c5c7
(cherry picked from commit f418b2e1)