Fix paths for Spaces container iframe

templates/composer.html

@@ -5,8 +5,8 @@
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     <title>Composer</title>
     <script src="https://kit.fontawesome.com/d6e88637ad.js" crossorigin="anonymous"></script>
-    <link rel="stylesheet" href="/static/style.css" />
-    <script src="{{ url_for('static', filename='script.js') }}"></script>
+    <link rel="stylesheet" href="static/style.css" />
+    <script src="static/script.js"></script>
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
   </head>