Revert "remove search bar in recents menu"

This reverts commit 5ab1f95a0ca44ee555f86e5f78465863a8a08733.
Systemui: Recents - do not add search widget on recents if widget is lost.

We have reports that sometimes under special circumstances the widget gets lost
and the view is added nevertheless

Ensure that if the widget loading fails that the id is set back to -1 to remove
the view.

Change-Id: I62f8dcea19817a243a001c80b6a4ab7b1e31a990