Site Health: Fix missing error icon in dot org status test.

The error indicator in the WordPress.org communication test lost its icon class, so no icon appeared when the check failed. Restore the icon class on the error element.

Props sabernhardt, valani9099, wildworks.
Fixes #65014.

git-svn-id: https://develop.svn.wordpress.org/trunk@62545 602fd350-edb4-49c9-b593-d223f7449a82

Author: t-hamano

src/wp-admin/includes/class-wp-site-health.php

@@ -1357,7 +1357,7 @@ public function get_test_dotorg_communication() {
 			$result['description'] .= sprintf(
 				'<p>%s</p>',
 				sprintf(
-					'<span class="error"><span class="screen-reader-text">%s</span></span> %s',
+					'<span class="dashicons error" aria-hidden="true"></span><span class="screen-reader-text">%s</span> %s',
 					/* translators: Hidden accessibility text. */
 					__( 'Error' ),
 					sprintf(