cover: tweak styles:

- `optimizeQuality` > `smooth` (CSS language evolution)
- Use `auto` instead of a fixed width.
- Add exceptions for heights and apply them to some previously modified templates.
- Remove `is-large` exception.
- Widen the content column on list curation.

bookwyrm/templates/book/edit_book.html

@@ -170,7 +170,7 @@
             <h2 class="title is-4">{% trans "Cover" %}</h2>
             <div class="columns">
                 <div class="column is-narrow">
-                    {% include 'snippets/book_cover.html' with book=book cover_class='is-small' %}
+                    {% include 'snippets/book_cover.html' with book=book cover_class='is-h-small' %}
                 </div>
                 <div class="column is-narrow">
                     <div class="block">