Small viewer fix (#490)

Author: slimbuck

src/splat-serialize.ts

@@ -1047,13 +1047,13 @@ const serializeViewer = async (splats: Splat[], options: ViewerExportSettings, w
         const style = '<link rel="stylesheet" href="./index.css">';
         const script = '<script type="module" src="./index.js"></script>';
         const settings = 'settings: fetch(settingsUrl).then(response => response.json())';
-        const content = 'contentUrl,';
+        const content = 'fetch(contentUrl)';
 
         const html = indexHtml
         .replace(style, `<style>\n${pad(indexCss, 12)}\n        </style>`)
         .replace(script, `<script type="module">\n${pad(indexJs, 12)}\n        </script>`)
         .replace(settings, `settings: ${JSON.stringify(experienceSettings)}`)
-        .replace(content, `contentUrl: "data:application/ply;base64,${encodeBase64(plyBuffer)}",`);
+        .replace(content, `fetch("data:application/ply;base64,${encodeBase64(plyBuffer)}")`);
 
         await writer.write(new TextEncoder().encode(html), true);
     } else {