Use THREAD_POOL_EXECUTOR when loading a contact

Checked other usescases too, but there are no other ones that're obviously
changeable.

Bug 5224505

Change-Id: I9703400e4a93f18e014fcd0e4386374eb0658548
diff --git a/src/com/android/contacts/ContactLoader.java b/src/com/android/contacts/ContactLoader.java
index a28b1db..8a2a6ca 100644
--- a/src/com/android/contacts/ContactLoader.java
+++ b/src/com/android/contacts/ContactLoader.java
@@ -1240,7 +1240,7 @@
     @Override
     protected void onForceLoad() {
         final LoadContactTask task = new LoadContactTask();
-        task.execute((Void[])null);
+        task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[])null);
     }
 
     @Override