Disable newlines in ListingContent

[neonfuz]

Fixes bug where lists are too spaced out because there's an extra line break added to the end of every item.

The data retrieved from the backend includes line breaks at the end of every item in a list. Rendering this line break as a
makes the items in a list too spaced out, because

elements already have their own vertical spacing.

This PR filters line breaks at the end of list items on the front end, instead of changing the back end code. I'm not sure if this is the preferred solution, so merge at your discretion.

Before:

After:

The state with said line breaks:

Tested locally with fakeship

PR Checklist

• Includes changes to desk files
• Describes how you tested the PR locally (test ship vs livenet)
• If a new feature, includes automated tests
• Comments added anywhere logic may be confusing without context

[latter-bolden]

Looks good to me! Confirmed the line breaks get removed.