Revert "[iOS] Set SelectedScopeButtonIndex for search bar"

This reverts commit f35f741c75f1b51b0060b07e7f19271ace8d0310.
Revert "Revert "[iOS] Set SelectedScopeButtonIndex for search bar""

This reverts commit 1d369f9fd9b4ee95222b4bb520e0a5a42d037fcc.