refactor(util/ticketing): only use result name for hash

src/main/java/de/hftstuttgart/utils/UnifiedTicketingUtil.java

@@ -151,9 +151,7 @@ public class UnifiedTicketingUtil {
             throw new UnifiedticketingException(e);
         }
 
-        byte[] data = digest.digest(String
-            .join(result.name, result.failureReason)
-            .getBytes(StandardCharsets.UTF_8));
+        byte[] data = digest.digest(result.name.getBytes(StandardCharsets.UTF_8));
         StringBuilder hexString = new StringBuilder(2 * data.length);
         for (byte character: data)
         {