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/TextReadingPreviewController.java

@@ -112,8 +112,10 @@ class TextReadingPreviewController extends BasePreferenceController implements
         mPreviewPreference.setPreviewAdapter(pagerAdapter);
         mPreviewPreference.setCurrentItem(
                 isLayoutRtl ? PREVIEW_SAMPLE_RES_IDS.length - 1 : FRAME_INITIAL_INDEX);
+
         final int initialPagerIndex =
                 mLastFontProgress * mDisplaySizeData.getValues().size() + mLastDisplayProgress;
+        mPreviewPreference.setLastLayerIndex(initialPagerIndex);
         pagerAdapter.setPreviewLayer(initialPagerIndex, LAYER_INITIAL_INDEX,
                 FRAME_INITIAL_INDEX, /* animate= */ false);
     }

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;
     }