Fix some widget picker recommended widgets bugs.

- Bind recommended widgets only when not in search mode. (b/183503774)
- Bind recommended widgets in onAttachedToWindow, Recommended widgets
are available in PopupDataProvider at this point. (b/185461866)

Bug: 183503774
Bug: 185461866
Test: tested manually
Change-Id: If24e5b2b3e69a695821b5f7d9f42ff4c89ae62fc