[fenix] For https://github.com/mozilla-mobile/fenix/issues/3998 - Make Turn On Sync Fragment scrollable in landscape

app/src/main/res/layout/fragment_turn_on_sync.xml

@@ -2,10 +2,11 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:fillViewport="true">
 
     <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
@@ -83,4 +84,4 @@
             app:layout_constraintTop_toBottomOf="@id/sign_in_scan_button" />
 
     </androidx.constraintlayout.widget.ConstraintLayout>
-</ScrollView>
+</androidx.core.widget.NestedScrollView>