Fine tune scroll behavior after model update

In search history patch, it add scroll to top call in model update
callback for better UX after search, however, it cause it always
scroll to top after preview file.
Revert code back in model update callback and scoll to top behavior
code to search callback.

Fix: 131423704
Test: manual
Test: atest DocumentsUIGoogleTests
Change-Id: I870bb15fb79c92e494d02f0c72a4f6a5a9d15a36