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/ActivityPicker.java

@@ -159,7 +159,7 @@ public class ActivityPicker extends AlertActivity implements
                     Resources res = packageManager.getResourcesForApplication(
                             iconResource.packageName);
                     icon = res.getDrawable(res.getIdentifier(
-                            iconResource.resourceName, null, null));
+                            iconResource.resourceName, null, null), null);
                 } catch (NameNotFoundException e) {
                     // Ignore
                 }