Fix move between EteSync lists

app/src/main/java/org/tasks/data/CaldavTask.java

@@ -186,4 +186,8 @@ public class CaldavTask {
         + '\''
         + '}';
   }
+
+  public boolean isDeleted() {
+    return deleted > 0;
+  }
 }

app/src/main/java/org/tasks/etesync/EteSynchronizer.java

@@ -255,8 +255,12 @@ public class EteSynchronizer {
         case DELETE:
           dirty.remove(remoteId);
           if (caldavTask != null) {
+            if (caldavTask.isDeleted()) {
+              caldavDao.delete(caldavTask);
+            } else {
               taskDeleter.delete(caldavTask.getTask());
             }
+          }
           break;
       }
       caldavCalendar.setCtag(journalEntry.getUid());