SettingsAppWidgetProvider: do not use setWifiApEnabled

Calls to stop tethering should use stopTethering instead of
setWifiApEnabled.

Bug: 38017909
Test: manual
Change-Id: Ib43f8c29b190ba7bad9c5b2d6a01bc9558110890
diff --git a/src/com/android/settings/widget/SettingsAppWidgetProvider.java b/src/com/android/settings/widget/SettingsAppWidgetProvider.java
index 38fed94..7dacaf5 100644
--- a/src/com/android/settings/widget/SettingsAppWidgetProvider.java
+++ b/src/com/android/settings/widget/SettingsAppWidgetProvider.java
@@ -395,7 +395,10 @@
                     int wifiApState = wifiManager.getWifiApState();
                     if (desiredState && ((wifiApState == WifiManager.WIFI_AP_STATE_ENABLING) ||
                                          (wifiApState == WifiManager.WIFI_AP_STATE_ENABLED))) {
-                        wifiManager.setWifiApEnabled(null, false);
+                        final ConnectivityManager connectivityManager =
+                                (ConnectivityManager) context.getSystemService(
+                                        Context.CONNECTIVITY_SERVICE);
+                        connectivityManager.stopTethering(ConnectivityManager.TETHERING_WIFI);
                     }
 
                     wifiManager.setWifiEnabled(desiredState);