Site Icon: Move admin icon filter to its rightful place.

The action is unrelated to `WP_Site_Icon` itself.

Props kraftbj.
See #16434.



git-svn-id: https://develop.svn.wordpress.org/trunk@33011 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/admin-filters.php

@@ -47,6 +47,7 @@ add_filter( 'media_upload_tabs', 'update_gallery_tab' );
 // Misc hooks.
 add_action( 'admin_head', 'wp_admin_canonical_url'   );
 add_action( 'admin_head', 'wp_color_scheme_settings' );
+add_action( 'admin_head', 'wp_site_icon'             );
 add_action( 'admin_head', '_ipad_meta'               );
 
 add_action( 'post_edit_form_tag', 'post_form_autocomplete_off' );

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

@@ -58,8 +58,6 @@ class WP_Site_Icon {
 	public function __construct() {
 
 		// Add the favicon to the backend.
-		add_action( 'admin_head', 'wp_site_icon' );
-
 		add_action( 'admin_menu', array( $this, 'admin_menu_upload_site_icon' ) );
 
 		add_action( 'admin_action_set_site_icon',    array( $this, 'set_site_icon'    ) );