Fixes the conditions for when to enqueue the opinionated block styles (i.e. `'wp-block-library-theme'` stylesheet):
* the theme adds `'wp-block-styles'` theme support;
* and no editor styles are declared.
This resolves an issue with themes that do not add the `'wp-block-styles'` theme support while not impacting themes that do.
Follow-up to [53419], [52069], [50761], [44157].
Props mikachan, costdev, glendaviesnz, hellofromTonya, jffng, mamaduka, ndiego, poena, sannevndrmeulen, scruffian.
Fixes#57561.
Built from https://develop.svn.wordpress.org/trunk@55368
git-svn-id: http://core.svn.wordpress.org/trunk@54901 1a063a9b-81f0-0310-95a4-ce76da25c4cd
5bf74c0433