Fixed compiler errors in subtasks unit tests

tests/src/com/todoroo/astrid/subtasks/SubtasksHelperTest.java

@@ -11,7 +11,7 @@ public class SubtasksHelperTest extends SubtasksTestCase {
     protected void setUp() throws Exception {
         super.setUp();
         createTasks();
-        updater.initializeFromSerializedTree(null, filter, DEFAULT_SERIALIZED_TREE);
+        updater.initializeFromSerializedTree(SubtasksUpdater.ACTIVE_TASKS_ORDER, filter, DEFAULT_SERIALIZED_TREE);
     }
 
     private Task createTask(String title, long remoteId) {

tests/src/com/todoroo/astrid/subtasks/SubtasksMovingTest.java

@@ -11,7 +11,7 @@ public class SubtasksMovingTest extends SubtasksTestCase {
     protected void setUp() throws Exception {
         super.setUp();
         createTasks();
-        updater.initializeFromSerializedTree(null, filter, DEFAULT_SERIALIZED_TREE);
+        updater.initializeFromSerializedTree(SubtasksUpdater.ACTIVE_TASKS_ORDER, filter, DEFAULT_SERIALIZED_TREE);
 
         // Assert initial state is correct
         expectParentAndPosition(A, null, 0);

tests/src/com/todoroo/astrid/subtasks/SubtasksTestCase.java

@@ -14,7 +14,7 @@ import com.todoroo.astrid.test.DatabaseTestCase;
  */
 public class SubtasksTestCase extends DatabaseTestCase {
 
-    protected SubtasksUpdater updater;
+    protected SubtasksUpdater<String> updater;
     protected Filter filter;
 
     /* Starting State:
@@ -33,7 +33,7 @@ public class SubtasksTestCase extends DatabaseTestCase {
         super.setUp();
         filter = CoreFilterExposer.buildInboxFilter(getContext().getResources());
         Preferences.clear(SubtasksUpdater.ACTIVE_TASKS_ORDER);
-        updater = new SubtasksUpdater();
+        updater = new SubtasksFilterUpdater();
     }
 
     protected void expectParentAndPosition(Task task, Task parent, int positionInParent) {