Privacy: Add newlines to the index.php file in wp-personal-data-exports directory, for consistency with other similar files.

Follow-up to [50037].

See #52299.

git-svn-id: https://develop.svn.wordpress.org/trunk@50055 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/privacy-tools.php

@@ -328,7 +328,7 @@ function wp_privacy_generate_personal_data_export_file( $request_id ) {
 		if ( false === $file ) {
 			wp_send_json_error( __( 'Unable to protect personal data export folder from browsing.' ) );
 		}
-		fwrite( $file, '<?php // Silence is golden.' );
+		fwrite( $file, "<?php\n// Silence is golden.\n" );
 		fclose( $file );
 	}