Fix power widget brightness.

If the auto-brightness is cleared, the brightness will drop to 0, so we
need to set it again.

src/com/android/settings/widget/SettingsAppWidgetProvider.java

@@ -397,6 +397,8 @@ public class SettingsAppWidgetProvider extends AppWidgetProvider {
                     Settings.System.putInt(context.getContentResolver(),
                             Settings.System.SCREEN_BRIGHTNESS_MODE,
                             0);
+                    // Set it again in case auto brightness was on
+                    power.setBacklightBrightness(brightness);
                 }
             }
         } catch (RemoteException e) {