Fix double help icon in wificalling screen

Change-Id: I36d4af83e1cb7fd77b360829baab2004422488c6
Fixes: 71538192
Test: robotests

src/com/android/settings/wifi/calling/WifiCallingSettingsForSub.java

@@ -156,7 +156,7 @@ public class WifiCallingSettingsForSub extends SettingsPreferenceFragment
 
         final SettingsActivity activity = (SettingsActivity) getActivity();
 
-        mEmptyView = (TextView) getView().findViewById(android.R.id.empty);
+        mEmptyView = getView().findViewById(android.R.id.empty);
         setEmptyView(mEmptyView);
         String emptyViewText = activity.getString(R.string.wifi_calling_off_explanation)
                 + activity.getString(R.string.wifi_calling_off_explanation_2);
@@ -216,6 +216,12 @@ public class WifiCallingSettingsForSub extends SettingsPreferenceFragment
         return MetricsEvent.WIFI_CALLING_FOR_SUB;
     }
 
+    @Override
+    public int getHelpResource() {
+        // Return 0 to suppress help icon. The help will be populated by parent page.
+        return 0;
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);