Make sure search recycler view is bound to fast scroller if user is

in search mode at the time of attachment of work/personal recycler view.

Bug: 191980945
Test: Tested manually.
1) Open widget picker, scroll.
2) Enable dark mode, scroll.
3) Type search query, scroll.
4) Disable dark mode, scroll.
5) Have work profile in phone and repeat the above with work tab open
and search.

Change-Id: I106717091a88868c4bbe3fad0dd71c8344e9c8ed