Remove open task extra when switching filters on tablet (fixes bugs with dismissing task edit)

astrid/src/com/todoroo/astrid/activity/TaskListActivity.java

@@ -360,6 +360,8 @@ public class TaskListActivity extends AstridActivity implements MainMenuListener
             tlfPager.showFilter((Filter) item);
             return true;
         }
+
+        getIntent().removeExtra(OPEN_TASK);
         TaskEditFragment tef = getTaskEditFragment();
         if (tef != null)
             onBackPressed();