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

This reverts commit 9037ceabd314f8d2b55144acffa780e7ba92291f.

Reason for revert: Presumed cause of b/202510128

Change-Id: I0daaab95d9bc57229c0c8c916cbe3ada7aafb6fa
diff --git a/src/com/android/settings/SettingsPreferenceFragment.java b/src/com/android/settings/SettingsPreferenceFragment.java
index 1d6a48d..b8ff60c 100644
--- a/src/com/android/settings/SettingsPreferenceFragment.java
+++ b/src/com/android/settings/SettingsPreferenceFragment.java
@@ -119,7 +119,8 @@
 
     @VisibleForTesting
     public HighlightablePreferenceGroupAdapter mAdapter;
-    private boolean mPreferenceHighlighted = false;
+    @VisibleForTesting
+    public boolean mPreferenceHighlighted = false;
 
     @Override
     public void onCreate(Bundle icicle) {