fix isset typo

web/html/list_providers.php

@@ -78,7 +78,7 @@ unset($p);
   <a href="add_provider.php" class="btn">Add Provider</a>
 <?php
 
-if (sset($_SESSION['authenticated'])){
+if (isset($_SESSION['authenticated'])){
   echo "<br>";
   echo "Welcome " . htmlspecialchars($_SESSION['name']);
 }