Revert "Revert "Support highlightable Settings homepage menu for 2-pane""

This reverts commit 096c090b805acbed1ea5a45f584ff5a24bd2fa3b.

Reason for revert: crash is fixed in this change

Bug: 202510128
Test: manual, build
Change-Id: Ifff8d58cfdcf43e123b11dee308665b2617cb4b3
diff --git a/src/com/android/settings/SettingsPreferenceFragment.java b/src/com/android/settings/SettingsPreferenceFragment.java
index b8ff60c..1d6a48d 100644
--- a/src/com/android/settings/SettingsPreferenceFragment.java
+++ b/src/com/android/settings/SettingsPreferenceFragment.java
@@ -119,8 +119,7 @@
 
     @VisibleForTesting
     public HighlightablePreferenceGroupAdapter mAdapter;
-    @VisibleForTesting
-    public boolean mPreferenceHighlighted = false;
+    private boolean mPreferenceHighlighted = false;
 
     @Override
     public void onCreate(Bundle icicle) {