Fix module preload path

sites/index.php

@@ -33,7 +33,7 @@
 		<link rel="canonical" href="https://sessioncommunities.online/">
 		<link rel="stylesheet" href="./index.css">
 		<script type="module" src="./main.js"></script>
-		<link rel="modulepreload" href="./constants.js">
+		<link rel="modulepreload" href="js/constants.js">
 		<title>Self-updating list of active Session communities</title>
 		<meta name="description" content="
 			Directory of Session Open Groups — public chatrooms within Session Messenger.