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/UserSpinnerAdapter.java

@@ -51,7 +51,7 @@ public class UserSpinnerAdapter implements SpinnerAdapter {
             UserInfo userInfo = um.getUserInfo(mUserHandle.getIdentifier());
             if (userInfo.isManagedProfile()) {
                 name = context.getString(R.string.managed_user_title);
-                icon = Resources.getSystem().getDrawable(
+                icon = context.getDrawable(
                     com.android.internal.R.drawable.ic_corp_icon);
             } else {
                 name = userInfo.name;