Change ScrollView to NestedScrollView for wifi_dialog

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: 182221182
Test: make RunSettingsLibRoboTests ROBOTEST_FILTER=com.android.settingslib.wifi
      manual visual
      In Settings -< Network & internet -> Wi-Fi -> Add network,
      select enterprise type and scroll the screen.
Change-Id: Ie9de753ee198409275e818a123b5ba7f9b6a1e26
diff --git a/res/layout/wifi_dialog.xml b/res/layout/wifi_dialog.xml
index 2cc6c8a..6f83e5c 100644
--- a/res/layout/wifi_dialog.xml
+++ b/res/layout/wifi_dialog.xml
@@ -14,7 +14,7 @@
      limitations under the License.
 -->
 
-<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
         android:id="@+id/dialog_scrollview"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -704,4 +704,4 @@
             </LinearLayout>
         </LinearLayout>
     </LinearLayout>
-</ScrollView>
+</androidx.core.widget.NestedScrollView>