assistant: Initialize the UI font in the prompt library window (#12701)

This PR fixes an issue where the prompt library did not properly have
the UI font or rem size set.

Since it is being opened in a new window, we need to re-initialize these
values the same way we do in the main window.

Release Notes:

- N/A
29d29f5a90Marshall Bowers committed on 6/5/2024, 9:41:03 PM· committed by GitHubparent9824e40
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