Update Settings to use themed Context.getDrawable()

Explicit null theme is passed when using Resources.getDrawable() and
no theme is available, e.g. when using getResourcesForApplication().
This fixes an issue with ic_text_dot theming and helps avoid similar
issues in the future.

BUG: 17648301
Change-Id: I3e97c3490b6f2a55744f567b21284f2935ae9af7

src/com/android/settings/notification/NotificationStation.java

@@ -275,7 +275,7 @@ public class NotificationStation extends SettingsPreferenceFragment {
         }
 
         try {
-            return r.getDrawable(resId);
+            return r.getDrawable(resId, null);
         } catch (RuntimeException e) {
             Log.w(TAG, "Icon not found in "
                     + (pkg != null ? resId : "<system>")