[4.0] Click Saving error of two-factor alternate of profile in PHP 8 (#…

…32540)

Co-authored-by: Richard Fath <[email protected]>

administrator/components/com_users/src/Model/UserModel.php

@@ -257,7 +257,7 @@ public function save($data)
 		}
 
 		// Handle the two factor authentication setup
-		if (array_key_exists('twofactor', $data))
+		if (isset($data['twofactor']['method']))
 		{
 			$twoFactorMethod = $data['twofactor']['method'];