Change ScrollView to NestedScrollView for language list

After enabling collapsing toolbar, ScrollView is not working with
CoordinatorLayout. So we need to update it to NestedScrollView to make
it work with CoordinatorLayout.

Bug: 181737215
Test: visual verified
1) Settings -> System -> Languages & input -> Languages
2) Add 6-8 languages to the list
3) Scrolling the list to see if it's smooth

Change-Id: Id47dfc225585ddd4469838ff0898495cda3f6c44