Site Editor: Include style parameter in home template redirect.

When redirecting the site editor to the home template include the `style` querystring parameter if it is set. This ensures the style panel opens if the user expects it.

Props grantmkin, mamaduka, peterwilsoncc.
Fixes #55752.



git-svn-id: https://develop.svn.wordpress.org/trunk@53413 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/site-editor.php

@@ -29,6 +29,9 @@ if ( ! wp_is_block_theme() ) {
  */
 $home_template = _resolve_home_block_template();
 if ( $home_template && empty( $_GET['postType'] ) && empty( $_GET['postId'] ) ) {
+	if ( ! empty( $_GET['styles'] ) ) {
+		$home_template['styles'] = sanitize_key( $_GET['styles'] );
+	}
 	$redirect_url = add_query_arg(
 		$home_template,
 		admin_url( 'site-editor.php' )