userdata.php: fix typo that broke demo. (Found by Claude.)

Author: dkegel-fastly

vuln_apps/src/userdata.php

@@ -11,7 +11,7 @@
 			$conn = new MongoClient('mongodb://127.0.0.1');
 			$db = $conn->appUserData;
 				$collection = $db->users;
-				$search = $_GET['usersearch'];
+				$usersearch = $_GET['usersearch'];
 				$js = "function () { var query = '". $usersearch . "'; return this.username == query;}";
 				print $js;
 				print '<br/>';
@@ -45,4 +45,4 @@
 			<?php echo $result; ?>
 		</div>
 	</body>
-</html>
+</html>