inconsistent handling of enter/return when editing a list

[dillonplunkett]

Describe the bug
When editing a list, hitting enter/return will add (or remove) the first item in the auto-suggest list, except if you've typed the entire card name, in which case it will do nothing.

To Reproduce
Steps to reproduce the behavior:

1. Open the edit interface for a cube.
2. Type Wonde or Wonder as a card to add.
3. Press enter/return.

Expected behavior
Wonder (or whichever card) to be added to the list in either case. Instead, it is added for Wonde and nothing happens for Wonder.

Desktop (please complete the following information):
Firefox on MacOS