Accessibility shortcut secondary action - auto hide divider in shortcutPreference

- Hide divider when settings view is gone.

Bug: 142530063
Test: manual
Change-Id: I07c9aa628c4e300d1fd21fe5b87c18ff1c294e17

res/layout/accessibility_shortcut_secondary_action.xml

@@ -87,6 +87,7 @@
     </LinearLayout>
 
     <View
+        android:id="@+id/divider"
         android:layout_width="1dp"
         android:layout_height="match_parent"
         android:layout_marginTop="16dp"

src/com/android/settings/accessibility/ShortcutPreference.java

@@ -73,9 +73,11 @@ public class ShortcutPreference extends Preference {
         }
 
         final View settings = holder.itemView.findViewById(android.R.id.widget_frame);
-        if (settings != null) {
+        final View divider = holder.itemView.findViewById(R.id.divider);
+        if (settings != null && divider != null) {
             settings.setOnClickListener(view -> callOnSettingsClicked());
             settings.setVisibility(mSettingsVisibility);
+            divider.setVisibility(mSettingsVisibility);
         }
     }