Fix overlapping icons on display size page.

Action:
Update the correct state over cache value.

Bug: 258268965
Test: manual test
Change-Id: I5ce4b847a2d8229ab2f9188cab369a43b55afbe0

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

@@ -105,6 +105,10 @@ public class TextReadingPreviewPreference extends Preference {
         }
     }
 
+    void setLastLayerIndex(int lastLayerIndex) {
+        mLastLayerIndex = lastLayerIndex;
+    }
+
     int getCurrentItem() {
         return mCurrentItem;
     }