Change SettingsAppWidgetProvider export to be false

This will protect settings from external broadcaster.
bug 7961958

Change-Id: Id6d0bf83ef19f2b5c2641231cba2dc65a1492797
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index c26b6f2..4e8ef57 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1581,7 +1581,7 @@
 
         <receiver android:name=".widget.SettingsAppWidgetProvider"
                 android:label="@string/gadget_title"
-                android:exported="true"
+                android:exported="false"
                 android:enabled="@bool/has_powercontrol_widget">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />