Hide saved network preference when there is none.

We already do this when wifi is enabled. This change brings same
behavior when wifi is off.

Change-Id: I44301fe46a6183735f8be71c80cfe719ad0e82b4
Fix: 62094681
Test: runtest --path tests/unit/src/com/android/settings/wifi/WifiSettingsUiTest.java

src/com/android/settings/wifi/WifiSettings.java

@@ -697,6 +697,7 @@ public class WifiSettings extends RestrictedSettingsFragment
 
             case WifiManager.WIFI_STATE_DISABLED:
                 setOffMessage();
+                setAdditionalSettingsSummaries();
                 setProgressBarVisible(false);
                 break;
         }