Fix dynamic style switching when CSS are optimized in D10

The bug seems to appear only when $config['system.performance']['css']['preprocess'] = TRUE. When it is so, the library's media attribute is changed from the custom value to 'all', so \Drupal\styleswitcher\StyleswitcherElementInfoAlter::preRenderHtmlTag() doesn't set the id attribute to the link element.

Thanks for this fix! I was banging my head against the wall thinking there was something wrong with my theme or cache.

Automatically closed - issue fixed for 2 weeks with no activity.