Unlinking an URL on the card description changes it to inline link, instead of plain text without an hyperlink

Issue Summary

When editing a card description, if you paste a URL on a card description and unlink it, once you save the link will be displayed as you had selected “Display Inline” option, and is no longer plaintext.

Steps to Reproduce

1. Open a card
2. Click "Edit" to alter the description
3. Enter a URL (e.g. https://trello.com/ 
4. Click the link, and select the "Unlink" option to revert the URL to plaintext
5. Save changes

Expected Results

URL is retained as plaintext, so that viewers can see the full text of the URL itself

Actual Results

The link is displayed on the card back as if the "Display Inline" link setting was selected. Going in to edit the card, the link is displayed with the "URL" setting turned back on.

Workaround

Formatting the URL text with the "Code" formatting option will force it to be displayed as plaintext