ToDo accepted but not in the list of assigned user

[AayushChaudhary0001]

Please read issue #217 for better understanding of this.

If you assign an already created ToDo to a user, then it is auto-accepted, but not visible in the list of the accepted user.

Steps to reproduce:-

1. Create a todo and save it.
2. Assign that todo to any user afterwards.
3. Open the account of teh user to whom the todo is assigned.
4. Open the my todo list in the RHS.

According to the post created, this todo is already accepted. But it is not visible in the todo list of the user.