Dropbutton extending off page when creating a new Library item

Problem/Motivation

When adding a new library item, choosing a Paragraph from a Dropbutton widget causes the dropdown to extend beyond the left edge of the screen.

* Note: in our system, we have written a custom module that renames "Paragraph" to "Reusable".

Steps to reproduce

On a site using Paragraph Library items, where the field widget for selecting a Paragraph uses a dropbutton select, try to select a Paragraph.

Proposed resolution

There is a specificity hack in the Gin theme that targets Node Forms, but the Library form doesn't get it because it doesn't match the classes used.

.node-form :where(*) .dropbutton .dropbutton__items,
.node-form :is(#extra-specificity-hack, [data-drupal-admin-styles]) .dropbutton .dropbutton__items {
  inset-inline-start: 0;
  inset-inline-end: auto;
}

Should be easy enough to copy this hack, prefixed with `.paragraphs-library-item-form` instead of `.node-form`.