Customize: Load the default site icon from the `wp-includes` directory.

Files inside the `wp-admin` directory may not be publicly available.

Follow-up to [36635], [47018].

Props whyisjake, finomeno, ocean90.
Fixes #50131.
Built from https://develop.svn.wordpress.org/trunk@47832


git-svn-id: http://core.svn.wordpress.org/trunk@47608 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/embed.php

@@ -1184,8 +1184,8 @@ function the_embed_site_title() {
 	$site_title = sprintf(
 		'<a href="%s" target="_top"><img src="%s" srcset="%s 2x" width="32" height="32" alt="" class="wp-embed-site-icon"/><span>%s</span></a>',
 		esc_url( home_url() ),
-		esc_url( get_site_icon_url( 32, admin_url( 'images/w-logo-blue.png' ) ) ),
-		esc_url( get_site_icon_url( 64, admin_url( 'images/w-logo-blue.png' ) ) ),
+		esc_url( get_site_icon_url( 32, includes_url( 'images/w-logo-blue.png' ) ) ),
+		esc_url( get_site_icon_url( 64, includes_url( 'images/w-logo-blue.png' ) ) ),
 		esc_html( get_bloginfo( 'name' ) )
 	);
 

wp-includes/functions.php

@@ -1668,7 +1668,7 @@ function do_favicon() {
 	 */
 	do_action( 'do_faviconico' );
 
-	wp_redirect( get_site_icon_url( 32, admin_url( 'images/w-logo-blue.png' ) ) );
+	wp_redirect( get_site_icon_url( 32, includes_url( 'images/w-logo-blue.png' ) ) );
 	exit;
 }
 

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-47821';
+$wp_version = '5.5-alpha-47832';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.