Fix admin portal syntax error

- Escaped closing script tag in template string to prevent 'Unexpected end of input' error
- This was breaking the admin portal login page

Author: Ankit Khare

admin.html

@@ -679,7 +679,7 @@ <h2 id="modalTitle">Add Certificate</h2>
     <script>
         // Redirect to the main certificate verification page with the ID parameter
         window.location.href = '../certificates.html?id=${cert.id}';
-    </script>
+    <\/script>
 
     <link rel="stylesheet" href="../assets/css/style.css?v=52">
     <link rel="stylesheet" href="../assets/css/matrix-theme.css?v=52">