DatabaseListFragment: Do not close the Cursor from CursorAdapter.getItem().

Because that breaks notification (refreshing the ListView) when we
delete an item via the ContentProvider's delete() method.
CursorAdapter is not properly documented:
https://code.google.com/p/android/issues/detail?id=69973&thanks=69973&ts=1400841331
Fix Adapator->Adapater typos.