Resolve "Update the Local Baserow service sort context styles."

What is in this MR

This MR adds missing styles to the Local Baserow service sort context.

How to test this MR

• Visit a page.
• Add a data source, pointing to a ListRows service type.
• Under the Sortings tab, click add.
• Note how the context looks nice.
• Do this again in develop, and note how it's missing styles.

Merge Request Checklist

• changelog.md has been updated if required.
• New/updated Premium/Enterprise features are separated correctly in the premium or enterprise folder
• The latest Chrome and Firefox have been used to test any new frontend features
• Documentation has been updated
• Quality Standards are met
• Performance: tables are still fast with 100k+ rows, 100+ field tables
• The redoc API pages have been updated for any REST API changes
• Our custom API docs are updated for changes to endpoints accessed via api tokens
• The UI/UX has been updated following UI Style Guide

Closes #2280 (closed)