[Large screen] Fix searched Subsettings back navigation bug

Settings app registers SubSettings SplitPairRule with clearTop
true, it will finish Settings app if users click back button on
a SubSettings page.

This change registers SubSettings SplitPairRule with clearTop
true when users click a SubSettings item in Settings home menu.

And this change registers SubSettings SplitPairRule with clearTop
false when users click a SubSettings item in search result.

Bug: 204501750
Test: manual
      1. Settings -> Search settings -> search a SubSettings item
         (e.g., Battery)
      2. Click the searched item.
      3. Click back button.
Change-Id: I6e1862de528e971137ae7087de608bbdd79096b2

src/com/android/settings/homepage/SettingsHomepageActivity.java

@@ -239,13 +239,15 @@ public class SettingsHomepageActivity extends FragmentActivity implements
                 targetComponentName,
                 targetIntent.getAction(),
                 true /* finishPrimaryWithSecondary */,
-                true /* finishSecondaryWithPrimary */);
+                true /* finishSecondaryWithPrimary */,
+                true /* clearTop*/);
         ActivityEmbeddingRulesController.registerTwoPanePairRule(this,
                 new ComponentName(Settings.class.getPackageName(), Settings.class.getName()),
                 targetComponentName,
                 targetIntent.getAction(),
                 true /* finishPrimaryWithSecondary */,
-                true /* finishSecondaryWithPrimary */);
+                true /* finishSecondaryWithPrimary */,
+                true /* clearTop*/);
         startActivity(targetIntent);
     }