Using custom threadpool executor instead of the one defined in AsyncTask

Change-Id: I8fe95d932c5de14c74f0576bfc3d1f641d12b448
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 49a6671..547f849 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -4735,7 +4735,7 @@
                     }
                     return null;
                 }
-            }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void) null);
+            }.executeOnExecutor(Utilities.THREAD_POOL_EXECUTOR);
         }
     }
 }