Inline link autocomplete is adding multiple links when selecting single from list

[greensomes]

Steps to reproduce:

• Add a list
• Add a list item where the where the text ends with an inline link
• Hit enter to add a new item
• View Editor.js raw value and observe that the new item is an empty link.

[greensomes]

I added a "custom" plugin that extends the NestedList class to utilize a fix that is currently in a PR that has been open for over a year.