Do not override the user-supplied value when creating a new list

- This was preventing the first value a user saved in a list from being set
  properly.
- To reproduce:
    - Run 'clip <new_list> <key> <value>'
    - Run 'clip <new_list>'
    - Notice that the 'value' of the above specified key would be 'Created
      <new_list> list' instead of the value user tried to save.